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			<div class="article-intro" id="content">
			
			<h1>Python3 循环语句</h1>
<p>本章节将为大家介绍 Python 
循环语句的使用。</p>
<p>Python 中的循环语句有 for 和 while。</p>
<p>Python 循环语句的控制结构图如下所示：</p>
<p>
<img decoding="async" src="./Python3 循环语句 _ 菜鸟教程_files/loop.png">
</p>
<hr>
<h2>
while 循环
</h2>
<p>Python 中 while 语句的一般形式：</p>

<pre class="prettyprint prettyprinted" style=""><span class="kwd">while</span><span class="pln"> </span><span class="pun">判断条件(</span><span class="pln">condition</span><span class="pun">)：</span><span class="pln">
    </span><span class="pun">执行语句(</span><span class="pln">statements</span><span class="pun">)……</span><button class="copy-code-button" type="button" data-clipboard-text="while 判断条件(condition)：
    执行语句(statements)……
"></button></pre>
<p>执行流程图如下：</p>
<p><img decoding="async" src="./Python3 循环语句 _ 菜鸟教程_files/886A6E10-58F1-4A9B-8640-02DBEFF0EF9A.jpg"></p>
<p>执行 Gif 演示：</p>
<p><img decoding="async" src="./Python3 循环语句 _ 菜鸟教程_files/006faQNTgw1f5wnm06h3ug30ci08cake.gif"></p>

<p>
同样需要注意冒号和缩进。另外，在 Python 中没有 do..while 循环。
</p>
<p>以下实例使用了 while 来计算 1 到 100 的总和：</p>
<div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-comment">#!/usr/bin/env python3</span><span class="hl-code">
 
</span><span class="hl-identifier">n</span><span class="hl-code"> = </span><span class="hl-number">100</span><span class="hl-code">
 
</span><span class="hl-identifier">sum</span><span class="hl-code"> = </span><span class="hl-number">0</span><span class="hl-code">
</span><span class="hl-identifier">counter</span><span class="hl-code"> = </span><span class="hl-number">1</span><span class="hl-code">
</span><span class="hl-reserved">while</span><span class="hl-code"> </span><span class="hl-identifier">counter</span><span class="hl-code"> &lt;= </span><span class="hl-identifier">n</span><span class="hl-code">:
    </span><span class="hl-identifier">sum</span><span class="hl-code"> = </span><span class="hl-identifier">sum</span><span class="hl-code"> + </span><span class="hl-identifier">counter</span><span class="hl-code">
    </span><span class="hl-identifier">counter</span><span class="hl-code"> += </span><span class="hl-number">1</span><span class="hl-code">
 
</span><span class="hl-identifier">print</span><span class="hl-brackets">(</span><span class="hl-quotes">"</span><span class="hl-string">1 到 %d 之和为: %d</span><span class="hl-quotes">"</span><span class="hl-code"> % </span><span class="hl-brackets">(</span><span class="hl-identifier">n</span><span class="hl-code">,</span><span class="hl-identifier">sum</span><span class="hl-brackets">)</span><span class="hl-brackets">)</span></div>
<button class="copy-code-button" type="button" data-clipboard-text="#!/usr/bin/env python3
 
n = 100
 
sum = 0
counter = 1
while counter &lt;= n:
    sum = sum + counter
    counter += 1
 
print(&quot;1 到 %d 之和为: %d&quot; % (n,sum))"></button></div>
</div>
<p>执行结果如下：</p>
<pre class="prettyprint prettyprinted" style=""><span class="lit">1</span><span class="pln"> </span><span class="pun">到</span><span class="pln"> </span><span class="lit">100</span><span class="pln"> </span><span class="pun">之和为:</span><span class="pln"> </span><span class="lit">5050</span><button class="copy-code-button" type="button" data-clipboard-text="1 到 100 之和为: 5050
"></button></pre>
<h3>无限循环</h3>
<p>我们可以通过设置条件表达式永远不为 false 来实现无限循环，实例如下：</p>
<div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-comment">#!/usr/bin/python3</span><span class="hl-code">
 
</span><span class="hl-identifier">var</span><span class="hl-code"> = </span><span class="hl-number">1</span><span class="hl-code">
</span><span class="hl-reserved">while</span><span class="hl-code"> </span><span class="hl-identifier">var</span><span class="hl-code"> == </span><span class="hl-number">1</span><span class="hl-code"> :  </span><span class="hl-comment"># 表达式永远为 true</span><span class="hl-code">
   </span><span class="hl-identifier">num</span><span class="hl-code"> = </span><span class="hl-builtin">int</span><span class="hl-brackets">(</span><span class="hl-builtin">input</span><span class="hl-brackets">(</span><span class="hl-quotes">"</span><span class="hl-string">输入一个数字  :</span><span class="hl-quotes">"</span><span class="hl-brackets">)</span><span class="hl-brackets">)</span><span class="hl-code">
   </span><span class="hl-identifier">print</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-quotes">"</span><span class="hl-string">你输入的数字是: </span><span class="hl-quotes">"</span><span class="hl-code">, </span><span class="hl-identifier">num</span><span class="hl-brackets">)</span><span class="hl-code">
 
</span><span class="hl-identifier">print</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-quotes">"</span><span class="hl-string">Good bye!</span><span class="hl-quotes">"</span><span class="hl-brackets">)</span></div>
<button class="copy-code-button" type="button" data-clipboard-text="#!/usr/bin/python3
 
var = 1
while var == 1 :  # 表达式永远为 true
   num = int(input(&quot;输入一个数字  :&quot;))
   print (&quot;你输入的数字是: &quot;, num)
 
print (&quot;Good bye!&quot;)" style="display: none;"></button></div>
</div>
<p>执行以上脚本，输出结果如下：</p>
<pre class="prettyprint prettyprinted" style=""><span class="pun">输入一个数字</span><span class="pln">  </span><span class="pun">:</span><span class="lit">5</span><span class="pln">
</span><span class="pun">你输入的数字是:</span><span class="pln">  </span><span class="lit">5</span><span class="pln">
</span><span class="pun">输入一个数字</span><span class="pln">  </span><span class="pun">:</span><button class="copy-code-button" type="button" data-clipboard-text="输入一个数字  :5
你输入的数字是:  5
输入一个数字  :
" style="display: none;"></button></pre>
<p>你可以使用 <b> CTRL+C</b> 来退出当前的无限循环。</p>
<p>无限循环在服务器上客户端的实时请求非常有用。</p>
<h3>while 循环使用 else 语句</h3><p>
如果 while 后面的条件语句为 false 时，则执行 else 的语句块。</p><p>语法格式如下：</p>
<pre class="prettyprint prettyprinted" style=""><span class="kwd">while</span><span class="pln"> </span><span class="str">&lt;expr&gt;</span><span class="pun">:</span><span class="pln">
    </span><span class="pun">&lt;</span><span class="pln">statement</span><span class="pun">(</span><span class="pln">s</span><span class="pun">)&gt;</span><span class="pln">
</span><span class="kwd">else</span><span class="pun">:</span><span class="pln">
    </span><span class="pun">&lt;</span><span class="pln">additional_statement</span><span class="pun">(</span><span class="pln">s</span><span class="pun">)&gt;</span><button class="copy-code-button" type="button" data-clipboard-text="while &lt;expr&gt;:
    &lt;statement(s)&gt;
else:
    &lt;additional_statement(s)&gt;" style="display: none;"></button></pre>
<p>expr 条件语句为 true 则执行 statement(s) 语句块，如果为 false，则执行 additional_statement(s)。</p>
<p>循环输出数字，并判断大小：</p>
<div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-comment">#!/usr/bin/python3</span><span class="hl-code">
 
</span><span class="hl-identifier">count</span><span class="hl-code"> = </span><span class="hl-number">0</span><span class="hl-code">
</span><span class="hl-reserved">while</span><span class="hl-code"> </span><span class="hl-identifier">count</span><span class="hl-code"> &lt; </span><span class="hl-number">5</span><span class="hl-code">:
   </span><span class="hl-identifier">print</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-identifier">count</span><span class="hl-code">, </span><span class="hl-quotes">"</span><span class="hl-string"> 小于 5</span><span class="hl-quotes">"</span><span class="hl-brackets">)</span><span class="hl-code">
   </span><span class="hl-identifier">count</span><span class="hl-code"> = </span><span class="hl-identifier">count</span><span class="hl-code"> + </span><span class="hl-number">1</span><span class="hl-code">
</span><span class="hl-reserved">else</span><span class="hl-code">:
   </span><span class="hl-identifier">print</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-identifier">count</span><span class="hl-code">, </span><span class="hl-quotes">"</span><span class="hl-string"> 大于或等于 5</span><span class="hl-quotes">"</span><span class="hl-brackets">)</span></div>
<button class="copy-code-button" type="button" data-clipboard-text="#!/usr/bin/python3
 
count = 0
while count &lt; 5:
   print (count, &quot; 小于 5&quot;)
   count = count + 1
else:
   print (count, &quot; 大于或等于 5&quot;)" style="display: none;"></button></div>
</div>
<p>执行以上脚本，输出结果如下：</p>
<pre class="prettyprint prettyprinted" style=""><span class="lit">0</span><span class="pln">  </span><span class="pun">小于</span><span class="pln"> </span><span class="lit">5</span><span class="pln">
</span><span class="lit">1</span><span class="pln">  </span><span class="pun">小于</span><span class="pln"> </span><span class="lit">5</span><span class="pln">
</span><span class="lit">2</span><span class="pln">  </span><span class="pun">小于</span><span class="pln"> </span><span class="lit">5</span><span class="pln">
</span><span class="lit">3</span><span class="pln">  </span><span class="pun">小于</span><span class="pln"> </span><span class="lit">5</span><span class="pln">
</span><span class="lit">4</span><span class="pln">  </span><span class="pun">小于</span><span class="pln"> </span><span class="lit">5</span><span class="pln">
</span><span class="lit">5</span><span class="pln">  </span><span class="pun">大于或等于</span><span class="pln"> </span><span class="lit">5</span><button class="copy-code-button" type="button" data-clipboard-text="0  小于 5
1  小于 5
2  小于 5
3  小于 5
4  小于 5
5  大于或等于 5
" style="display: none;"></button></pre><h3>
简单语句组</h3><p>
类似 if 语句的语法，如果你的 while 循环体中只有一条语句，你可以将该语句与 while 写在同一行中， 如下所示：</p>
<div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-comment">#!/usr/bin/python</span><span class="hl-code">
 
</span><span class="hl-identifier">flag</span><span class="hl-code"> = </span><span class="hl-number">1</span><span class="hl-code">
 
</span><span class="hl-identifier">while</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-identifier">flag</span><span class="hl-brackets">)</span><span class="hl-code">: </span><span class="hl-identifier">print</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">欢迎访问菜鸟教程!</span><span class="hl-quotes">'</span><span class="hl-brackets">)</span><span class="hl-code">
 
</span><span class="hl-identifier">print</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-quotes">"</span><span class="hl-string">Good bye!</span><span class="hl-quotes">"</span><span class="hl-brackets">)</span></div>
<button class="copy-code-button" type="button" data-clipboard-text="#!/usr/bin/python
 
flag = 1
 
while (flag): print (&#39;欢迎访问菜鸟教程!&#39;)
 
print (&quot;Good bye!&quot;)" style="display: none;"></button></div>
</div>
<p><strong>注意：</strong>以上的无限循环你可以使用 CTRL+C 来中断循环。</p>
<p>执行以上脚本，输出结果如下：</p>
<pre class="prettyprint prettyprinted" style=""><span class="pun">欢迎访问菜鸟教程!</span><span class="pln">
</span><span class="pun">欢迎访问菜鸟教程!</span><span class="pln">
</span><span class="pun">欢迎访问菜鸟教程!</span><span class="pln">
</span><span class="pun">欢迎访问菜鸟教程!</span><span class="pln">
</span><span class="pun">欢迎访问菜鸟教程!</span><span class="pln">
</span><span class="pun">……</span><button class="copy-code-button" type="button" data-clipboard-text="欢迎访问菜鸟教程!
欢迎访问菜鸟教程!
欢迎访问菜鸟教程!
欢迎访问菜鸟教程!
欢迎访问菜鸟教程!
……
" style="display: none;"></button></pre>
<hr>
<h2>for 语句</h2>
<p>Python for 循环可以遍历任何可迭代对象，如一个列表或者一个字符串。</p>
<p>for循环的一般格式如下：</p>
<div class="example">
<div class="example_code">
<div class="hl-main"><span class="hl-reserved">for</span><span class="hl-code"> &lt;</span><span class="hl-identifier">variable</span><span class="hl-code">&gt; </span><span class="hl-reserved">in</span><span class="hl-code"> &lt;</span><span class="hl-identifier">sequence</span><span class="hl-code">&gt;:
    &lt;</span><span class="hl-identifier">statements</span><span class="hl-code">&gt;
</span><span class="hl-reserved">else</span><span class="hl-code">:
    &lt;</span><span class="hl-identifier">statements</span><span class="hl-code">&gt;</span></div>
<button class="copy-code-button" type="button" data-clipboard-text="for &lt;variable&gt; in &lt;sequence&gt;:
    &lt;statements&gt;
else:
    &lt;statements&gt;"></button></div>
</div>
<p><strong>流程图：</strong></p>
<p><img decoding="async" src="./Python3 循环语句 _ 菜鸟教程_files/A71EC47E-BC53-4923-8F88-B027937EE2FF.jpg"></p>
<p>Python for 循环实例：</p>
<div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-comment">#!/usr/bin/python3</span><span class="hl-code">
 
</span><span class="hl-identifier">sites</span><span class="hl-code"> = </span><span class="hl-brackets">[</span><span class="hl-quotes">"</span><span class="hl-string">Baidu</span><span class="hl-quotes">"</span><span class="hl-code">, </span><span class="hl-quotes">"</span><span class="hl-string">Google</span><span class="hl-quotes">"</span><span class="hl-code">,</span><span class="hl-quotes">"</span><span class="hl-string">Runoob</span><span class="hl-quotes">"</span><span class="hl-code">,</span><span class="hl-quotes">"</span><span class="hl-string">Taobao</span><span class="hl-quotes">"</span><span class="hl-brackets">]</span><span class="hl-code">
</span><span class="hl-reserved">for</span><span class="hl-code"> </span><span class="hl-identifier">site</span><span class="hl-code"> </span><span class="hl-reserved">in</span><span class="hl-code"> </span><span class="hl-identifier">sites</span><span class="hl-code">:
    </span><span class="hl-identifier">print</span><span class="hl-brackets">(</span><span class="hl-identifier">site</span><span class="hl-brackets">)</span></div>
<button class="copy-code-button" type="button" data-clipboard-text="#!/usr/bin/python3
 
sites = [&quot;Baidu&quot;, &quot;Google&quot;,&quot;Runoob&quot;,&quot;Taobao&quot;]
for site in sites:
    print(site)"></button></div>
</div>
<p>以上代码执行输出结果为：</p>

<pre class="prettyprint prettyprinted" style=""><span class="typ">Baidu</span><span class="pln">
</span><span class="typ">Google</span><span class="pln">
</span><span class="typ">Runoob</span><span class="pln">
</span><span class="typ">Taobao</span><button class="copy-code-button" type="button" data-clipboard-text="Baidu
Google
Runoob
Taobao"></button></pre>
<p>也可用于打印字符串中的每个字符：</p>
<div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-comment">#!/usr/bin/python3</span><span class="hl-code">
 
</span><span class="hl-identifier">word</span><span class="hl-code"> = </span><span class="hl-quotes">'</span><span class="hl-string">runoob</span><span class="hl-quotes">'</span><span class="hl-code">
 
</span><span class="hl-reserved">for</span><span class="hl-code"> </span><span class="hl-identifier">letter</span><span class="hl-code"> </span><span class="hl-reserved">in</span><span class="hl-code"> </span><span class="hl-identifier">word</span><span class="hl-code">:
    </span><span class="hl-identifier">print</span><span class="hl-brackets">(</span><span class="hl-identifier">letter</span><span class="hl-brackets">)</span></div>
<button class="copy-code-button" type="button" data-clipboard-text="#!/usr/bin/python3
 
word = &#39;runoob&#39;
 
for letter in word:
    print(letter)"></button></div>
</div>
<p>以上代码执行输出结果为：</p>

<pre class="prettyprint prettyprinted" style=""><span class="pln">r
u
n
o
o
b</span><button class="copy-code-button" type="button" data-clipboard-text="r
u
n
o
o
b"></button></pre>
<p>
整数范围值可以配合 range() 函数使用：</p>
<div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-comment">#!/usr/bin/python3</span><span class="hl-code">
 
</span><span class="hl-comment">#  1 到 5 的所有数字：</span><span class="hl-code">
</span><span class="hl-reserved">for</span><span class="hl-code"> </span><span class="hl-identifier">number</span><span class="hl-code"> </span><span class="hl-reserved">in</span><span class="hl-code"> </span><span class="hl-builtin">range</span><span class="hl-brackets">(</span><span class="hl-number">1</span><span class="hl-code">, </span><span class="hl-number">6</span><span class="hl-brackets">)</span><span class="hl-code">:
    </span><span class="hl-identifier">print</span><span class="hl-brackets">(</span><span class="hl-identifier">number</span><span class="hl-brackets">)</span></div>
<button class="copy-code-button" type="button" data-clipboard-text="#!/usr/bin/python3
 
#  1 到 5 的所有数字：
for number in range(1, 6):
    print(number)"></button></div>
</div>
<p>以上代码执行输出结果为：</p>

<pre class="prettyprint prettyprinted" style=""><span class="lit">1</span><span class="pln">
</span><span class="lit">2</span><span class="pln">
</span><span class="lit">3</span><span class="pln">
</span><span class="lit">4</span><span class="pln">
</span><span class="lit">5</span><button class="copy-code-button" type="button" data-clipboard-text="1
2
3
4
5"></button></pre>

<hr>
<h2>for...else</h2>

<p>在 Python 中，for...else 语句用于在循环结束后执行一段代码。</p>
<p>语法格式如下：</p>
<pre class="prettyprint prettyprinted" style=""><span class="kwd">for</span><span class="pln"> item </span><span class="kwd">in</span><span class="pln"> iterable</span><span class="pun">:</span><span class="pln">
    </span><span class="com"># 循环主体</span><span class="pln">
</span><span class="kwd">else</span><span class="pun">:</span><span class="pln">
    </span><span class="com"># 循环结束后执行的代码</span><button class="copy-code-button" type="button" data-clipboard-text="for item in iterable:
    # 循环主体
else:
    # 循环结束后执行的代码"></button></pre>
<p>当循环执行完毕（即遍历完 iterable 中的所有元素）后，会执行 else 子句中的代码，如果在循环过程中遇到了 break 语句，则会中断循环，此时不会执行 else 子句。</p>

<div class="example"><h2 class="example">实例</h2> <div class="example_code">
<span style="color: Green;font-weight:bold;">for</span> x <span style="color: Green;font-weight:bold;">in</span> <span style="color: Teal;">range</span><span style="color: Olive;">(</span><span style="color: Maroon;">6</span><span style="color: Olive;">)</span>:<br>
&nbsp; <span style="color: Green;font-weight:bold;">print</span><span style="color: Olive;">(</span>x<span style="color: Olive;">)</span><br>
<span style="color: Green;font-weight:bold;">else</span>:<br>
&nbsp; <span style="color: Green;font-weight:bold;">print</span><span style="color: Olive;">(</span><span style="color: #a11;">"Finally finished!"</span><span style="color: Olive;">)</span><br>
<button class="copy-code-button" type="button" data-clipboard-text="for x in range(6):
  print(x)
else:
  print(&quot;Finally finished!&quot;)"></button></div></div>


<p>执行脚本后，输出结果为：</p>
<pre class="prettyprint prettyprinted" style=""><span class="lit">0</span><span class="pln">
</span><span class="lit">1</span><span class="pln">
</span><span class="lit">2</span><span class="pln">
</span><span class="lit">3</span><span class="pln">
</span><span class="lit">4</span><span class="pln">
</span><span class="lit">5</span><span class="pln">
</span><span class="typ">Finally</span><span class="pln"> finished</span><span class="pun">!</span><button class="copy-code-button" type="button" data-clipboard-text="0
1
2
3
4
5
Finally finished!" style="display: none;"></button></pre>


<p>以下 for 实例中使用了 break 语句，break 语句用于跳出当前循环体，不会执行 else 子句：</p>
<div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-comment">#!/usr/bin/python3</span><span class="hl-code">
 
</span><span class="hl-identifier">sites</span><span class="hl-code"> = </span><span class="hl-brackets">[</span><span class="hl-quotes">"</span><span class="hl-string">Baidu</span><span class="hl-quotes">"</span><span class="hl-code">, </span><span class="hl-quotes">"</span><span class="hl-string">Google</span><span class="hl-quotes">"</span><span class="hl-code">,</span><span class="hl-quotes">"</span><span class="hl-string">Runoob</span><span class="hl-quotes">"</span><span class="hl-code">,</span><span class="hl-quotes">"</span><span class="hl-string">Taobao</span><span class="hl-quotes">"</span><span class="hl-brackets">]</span><span class="hl-code">
</span><span class="hl-reserved">for</span><span class="hl-code"> </span><span class="hl-identifier">site</span><span class="hl-code"> </span><span class="hl-reserved">in</span><span class="hl-code"> </span><span class="hl-identifier">sites</span><span class="hl-code">:
    </span><span class="hl-reserved">if</span><span class="hl-code"> </span><span class="hl-identifier">site</span><span class="hl-code"> == </span><span class="hl-quotes">"</span><span class="hl-string">Runoob</span><span class="hl-quotes">"</span><span class="hl-code">:
        </span><span class="hl-identifier">print</span><span class="hl-brackets">(</span><span class="hl-quotes">"</span><span class="hl-string">菜鸟教程!</span><span class="hl-quotes">"</span><span class="hl-brackets">)</span><span class="hl-code">
        </span><span class="hl-reserved">break</span><span class="hl-code">
    </span><span class="hl-identifier">print</span><span class="hl-brackets">(</span><span class="hl-quotes">"</span><span class="hl-string">循环数据 </span><span class="hl-quotes">"</span><span class="hl-code"> + </span><span class="hl-identifier">site</span><span class="hl-brackets">)</span><span class="hl-code">
</span><span class="hl-reserved">else</span><span class="hl-code">:
    </span><span class="hl-identifier">print</span><span class="hl-brackets">(</span><span class="hl-quotes">"</span><span class="hl-string">没有循环数据!</span><span class="hl-quotes">"</span><span class="hl-brackets">)</span><span class="hl-code">
</span><span class="hl-identifier">print</span><span class="hl-brackets">(</span><span class="hl-quotes">"</span><span class="hl-string">完成循环!</span><span class="hl-quotes">"</span><span class="hl-brackets">)</span></div>
<button class="copy-code-button" type="button" data-clipboard-text="#!/usr/bin/python3
 
sites = [&quot;Baidu&quot;, &quot;Google&quot;,&quot;Runoob&quot;,&quot;Taobao&quot;]
for site in sites:
    if site == &quot;Runoob&quot;:
        print(&quot;菜鸟教程!&quot;)
        break
    print(&quot;循环数据 &quot; + site)
else:
    print(&quot;没有循环数据!&quot;)
print(&quot;完成循环!&quot;)"></button></div>
</div>

<p>执行脚本后，在循环到 "Runoob"时会跳出循环体：</p>
<pre class="prettyprint prettyprinted" style=""><span class="pun">循环数据</span><span class="pln"> </span><span class="typ">Baidu</span><span class="pln">
</span><span class="pun">循环数据</span><span class="pln"> </span><span class="typ">Google</span><span class="pln">
</span><span class="pun">菜鸟教程!</span><span class="pln">
</span><span class="pun">完成循环!</span><button class="copy-code-button" type="button" data-clipboard-text="循环数据 Baidu
循环数据 Google
菜鸟教程!
完成循环!
" style="display: none;"></button></pre>



<hr>
<h2>
range() 函数</h2>
<p>如果你需要遍历数字序列，可以使用内置 range() 函数。它会生成数列，例如:
</p>
<div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-code">&gt;&gt;&gt;</span><span class="hl-reserved">for</span><span class="hl-code"> </span><span class="hl-identifier">i</span><span class="hl-code"> </span><span class="hl-reserved">in</span><span class="hl-code"> </span><span class="hl-builtin">range</span><span class="hl-brackets">(</span><span class="hl-number">5</span><span class="hl-brackets">)</span><span class="hl-code">:
...     </span><span class="hl-identifier">print</span><span class="hl-brackets">(</span><span class="hl-identifier">i</span><span class="hl-brackets">)</span><span class="hl-code">
...
</span><span class="hl-number">0</span><span class="hl-code">
</span><span class="hl-number">1</span><span class="hl-code">
</span><span class="hl-number">2</span><span class="hl-code">
</span><span class="hl-number">3</span><span class="hl-code">
</span><span class="hl-number">4</span></div>
<button class="copy-code-button" type="button" data-clipboard-text="&gt;&gt;&gt;for i in range(5):
...     print(i)
...
0
1
2
3
4"></button></div>
</div>

<p>你也可以使用 range() 指定区间的值：</p>
<div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-code">&gt;&gt;&gt;</span><span class="hl-reserved">for</span><span class="hl-code"> </span><span class="hl-identifier">i</span><span class="hl-code"> </span><span class="hl-reserved">in</span><span class="hl-code"> </span><span class="hl-builtin">range</span><span class="hl-brackets">(</span><span class="hl-number">5</span><span class="hl-code">,</span><span class="hl-number">9</span><span class="hl-brackets">)</span><span class="hl-code"> :
    </span><span class="hl-identifier">print</span><span class="hl-brackets">(</span><span class="hl-identifier">i</span><span class="hl-brackets">)</span><span class="hl-code">
 
    
</span><span class="hl-number">5</span><span class="hl-code">
</span><span class="hl-number">6</span><span class="hl-code">
</span><span class="hl-number">7</span><span class="hl-code">
</span><span class="hl-number">8</span><span class="hl-code">
&gt;&gt;&gt;</span></div>
<button class="copy-code-button" type="button" data-clipboard-text="&gt;&gt;&gt;for i in range(5,9) :
    print(i)
 
    
5
6
7
8
&gt;&gt;&gt;"></button></div>
</div>
<p>
也可以使 range() 以指定数字开始并指定不同的增量(甚至可以是负数，有时这也叫做'步长'): 
</p>
<div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-code">&gt;&gt;&gt;</span><span class="hl-reserved">for</span><span class="hl-code"> </span><span class="hl-identifier">i</span><span class="hl-code"> </span><span class="hl-reserved">in</span><span class="hl-code"> </span><span class="hl-builtin">range</span><span class="hl-brackets">(</span><span class="hl-number">0</span><span class="hl-code">, </span><span class="hl-number">10</span><span class="hl-code">, </span><span class="hl-number">3</span><span class="hl-brackets">)</span><span class="hl-code"> :
    </span><span class="hl-identifier">print</span><span class="hl-brackets">(</span><span class="hl-identifier">i</span><span class="hl-brackets">)</span><span class="hl-code">
 
    
</span><span class="hl-number">0</span><span class="hl-code">
</span><span class="hl-number">3</span><span class="hl-code">
</span><span class="hl-number">6</span><span class="hl-code">
</span><span class="hl-number">9</span><span class="hl-code">
&gt;&gt;&gt;</span></div>
<button class="copy-code-button" type="button" data-clipboard-text="&gt;&gt;&gt;for i in range(0, 10, 3) :
    print(i)
 
    
0
3
6
9
&gt;&gt;&gt;"></button></div>
</div>
<p>负数：</p>
<div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-code">&gt;&gt;&gt;</span><span class="hl-reserved">for</span><span class="hl-code"> </span><span class="hl-identifier">i</span><span class="hl-code"> </span><span class="hl-reserved">in</span><span class="hl-code"> </span><span class="hl-builtin">range</span><span class="hl-brackets">(</span><span class="hl-code">-</span><span class="hl-number">10</span><span class="hl-code">, -</span><span class="hl-number">100</span><span class="hl-code">, -</span><span class="hl-number">30</span><span class="hl-brackets">)</span><span class="hl-code"> :
    </span><span class="hl-identifier">print</span><span class="hl-brackets">(</span><span class="hl-identifier">i</span><span class="hl-brackets">)</span><span class="hl-code">
 
    
-</span><span class="hl-number">10</span><span class="hl-code">
-</span><span class="hl-number">40</span><span class="hl-code">
-</span><span class="hl-number">70</span><span class="hl-code">
&gt;&gt;&gt;</span></div>
<button class="copy-code-button" type="button" data-clipboard-text="&gt;&gt;&gt;for i in range(-10, -100, -30) :
    print(i)
 
    
-10
-40
-70
&gt;&gt;&gt;" style="display: none;"></button></div>
</div>
<p>您可以结合 range() 和 len() 函数以遍历一个序列的索引,如下所示:</p>
<div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-code">&gt;&gt;&gt;</span><span class="hl-identifier">a</span><span class="hl-code"> = </span><span class="hl-brackets">[</span><span class="hl-quotes">'</span><span class="hl-string">Google</span><span class="hl-quotes">'</span><span class="hl-code">, </span><span class="hl-quotes">'</span><span class="hl-string">Baidu</span><span class="hl-quotes">'</span><span class="hl-code">, </span><span class="hl-quotes">'</span><span class="hl-string">Runoob</span><span class="hl-quotes">'</span><span class="hl-code">, </span><span class="hl-quotes">'</span><span class="hl-string">Taobao</span><span class="hl-quotes">'</span><span class="hl-code">, </span><span class="hl-quotes">'</span><span class="hl-string">QQ</span><span class="hl-quotes">'</span><span class="hl-brackets">]</span><span class="hl-code">
&gt;&gt;&gt; </span><span class="hl-reserved">for</span><span class="hl-code"> </span><span class="hl-identifier">i</span><span class="hl-code"> </span><span class="hl-reserved">in</span><span class="hl-code"> </span><span class="hl-builtin">range</span><span class="hl-brackets">(</span><span class="hl-builtin">len</span><span class="hl-brackets">(</span><span class="hl-identifier">a</span><span class="hl-brackets">)</span><span class="hl-brackets">)</span><span class="hl-code">:
...     </span><span class="hl-identifier">print</span><span class="hl-brackets">(</span><span class="hl-identifier">i</span><span class="hl-code">, </span><span class="hl-identifier">a</span><span class="hl-brackets">[</span><span class="hl-identifier">i</span><span class="hl-brackets">]</span><span class="hl-brackets">)</span><span class="hl-code">
... 
</span><span class="hl-number">0</span><span class="hl-code"> </span><span class="hl-identifier">Google</span><span class="hl-code">
</span><span class="hl-number">1</span><span class="hl-code"> </span><span class="hl-identifier">Baidu</span><span class="hl-code">
</span><span class="hl-number">2</span><span class="hl-code"> </span><span class="hl-identifier">Runoob</span><span class="hl-code">
</span><span class="hl-number">3</span><span class="hl-code"> </span><span class="hl-identifier">Taobao</span><span class="hl-code">
</span><span class="hl-number">4</span><span class="hl-code"> </span><span class="hl-identifier">QQ</span><span class="hl-code">
&gt;&gt;&gt;</span></div>
<button class="copy-code-button" type="button" data-clipboard-text="&gt;&gt;&gt;a = [&#39;Google&#39;, &#39;Baidu&#39;, &#39;Runoob&#39;, &#39;Taobao&#39;, &#39;QQ&#39;]
&gt;&gt;&gt; for i in range(len(a)):
...     print(i, a[i])
... 
0 Google
1 Baidu
2 Runoob
3 Taobao
4 QQ
&gt;&gt;&gt;"></button></div>
</div>
<p>还可以使用 range() 函数来创建一个列表：</p>
<div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-code">&gt;&gt;&gt;</span><span class="hl-builtin">list</span><span class="hl-brackets">(</span><span class="hl-builtin">range</span><span class="hl-brackets">(</span><span class="hl-number">5</span><span class="hl-brackets">)</span><span class="hl-brackets">)</span><span class="hl-code">
</span><span class="hl-brackets">[</span><span class="hl-number">0</span><span class="hl-code">, </span><span class="hl-number">1</span><span class="hl-code">, </span><span class="hl-number">2</span><span class="hl-code">, </span><span class="hl-number">3</span><span class="hl-code">, </span><span class="hl-number">4</span><span class="hl-brackets">]</span><span class="hl-code">
&gt;&gt;&gt;</span></div>
<button class="copy-code-button" type="button" data-clipboard-text="&gt;&gt;&gt;list(range(5))
[0, 1, 2, 3, 4]
&gt;&gt;&gt;"></button></div>
</div>

<p>更多关于 range() 函数用法参考：<a href="https://www.runoob.com/python3/python3-func-range.html" rel="noopener" target="_blank">https://www.runoob.com/python3/python3-func-range.html</a></p>
<hr>
<h2>
break 和 continue 语句及循环中的 else 子句
</h2>
<p><strong>break 执行流程图：</strong></p>
<p><img decoding="async" src="./Python3 循环语句 _ 菜鸟教程_files/E5A591EF-6515-4BCB-AEAA-A97ABEFC5D7D.jpg"></p>
<p><strong>continue 执行流程图：</strong></p>

<p><img decoding="async" src="./Python3 循环语句 _ 菜鸟教程_files/8962A4F1-B78C-4877-B328-903366EA1470.jpg">
</p><p>while 语句代码执行过程：</p>
<p>
<img decoding="async" width="50%" src="./Python3 循环语句 _ 菜鸟教程_files/python-while.webp">
</p>
<p>for 语句代码执行过程：</p><p>
<img decoding="async" src="./Python3 循环语句 _ 菜鸟教程_files/break-continue-536.png">
</p>
<p><strong>break</strong> 语句可以跳出 for 和 while 的循环体。如果你从 for 或 while 循环中终止，任何对应的循环 else 块将不执行。
</p>
<p><strong>continue</strong> 语句被用来告诉 Python 跳过当前循环块中的剩余语句，然后继续进行下一轮循环。
</p>
<h3>实例</h3>
<p>
while 中使用 break：</p>
<div class="example"><h2 class="example">实例</h2> <div class="example_code">
n <span style="color: Gray;">=</span> <span style="color: Maroon;">5</span><br>
<span style="color: Green;font-weight:bold;">while</span> n <span style="color: Gray;">&gt;</span> <span style="color: Maroon;">0</span>:<br>
&nbsp; &nbsp; n -<span style="color: Gray;">=</span> <span style="color: Maroon;">1</span><br>
&nbsp; &nbsp; <span style="color: Green;font-weight:bold;">if</span> n <span style="color: Gray;">==</span> <span style="color: Maroon;">2</span>:<br>
&nbsp; &nbsp; &nbsp; &nbsp; <span style="color: Green;font-weight:bold;">break</span><br>
&nbsp; &nbsp; <span style="color: Green;font-weight:bold;">print</span><span style="color: Olive;">(</span>n<span style="color: Olive;">)</span><br>
<span style="color: Green;font-weight:bold;">print</span><span style="color: Olive;">(</span><span style="color: #a11;">'循环结束。'</span><span style="color: Olive;">)</span><br>
<button class="copy-code-button" type="button" data-clipboard-text="n = 5
while n &gt; 0:
    n -= 1
    if n == 2:
        break
    print(n)
print(&#39;循环结束。&#39;)"></button></div></div>

<p>输出结果为：</p>
<pre class="prettyprint prettyprinted" style=""><span class="lit">4</span><span class="pln">
</span><span class="lit">3</span><span class="pln">
</span><span class="pun">循环结束。</span><button class="copy-code-button" type="button" data-clipboard-text="4
3
循环结束。"></button></pre>

<p>while 中使用 continue：</p>
<div class="example"><h2 class="example">实例</h2> <div class="example_code">
n <span style="color: Gray;">=</span> <span style="color: Maroon;">5</span><br>
<span style="color: Green;font-weight:bold;">while</span> n <span style="color: Gray;">&gt;</span> <span style="color: Maroon;">0</span>:<br>
&nbsp; &nbsp; n -<span style="color: Gray;">=</span> <span style="color: Maroon;">1</span><br>
&nbsp; &nbsp; <span style="color: Green;font-weight:bold;">if</span> n <span style="color: Gray;">==</span> <span style="color: Maroon;">2</span>:<br>
&nbsp; &nbsp; &nbsp; &nbsp; <span style="color: Green;font-weight:bold;">continue</span><br>
&nbsp; &nbsp; <span style="color: Green;font-weight:bold;">print</span><span style="color: Olive;">(</span>n<span style="color: Olive;">)</span><br>
<span style="color: Green;font-weight:bold;">print</span><span style="color: Olive;">(</span><span style="color: #a11;">'循环结束。'</span><span style="color: Olive;">)</span><br>
<button class="copy-code-button" type="button" data-clipboard-text="n = 5
while n &gt; 0:
    n -= 1
    if n == 2:
        continue
    print(n)
print(&#39;循环结束。&#39;)" style="display: none;"></button></div></div>
<p>输出结果为：</p>
<pre class="prettyprint prettyprinted" style=""><span class="lit">4</span><span class="pln">
</span><span class="lit">3</span><span class="pln">
</span><span class="lit">1</span><span class="pln">
</span><span class="lit">0</span><span class="pln">
</span><span class="pun">循环结束。</span><button class="copy-code-button" type="button" data-clipboard-text="4
3
1
0
循环结束。" style="display: none;"></button></pre>
<p>更多实例如下：</p>
<div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-comment">#!/usr/bin/python3</span><span class="hl-code">
 
</span><span class="hl-reserved">for</span><span class="hl-code"> </span><span class="hl-identifier">letter</span><span class="hl-code"> </span><span class="hl-reserved">in</span><span class="hl-code"> </span><span class="hl-quotes">'</span><span class="hl-string">Runoob</span><span class="hl-quotes">'</span><span class="hl-code">:     </span><span class="hl-comment"># 第一个实例</span><span class="hl-code">
   </span><span class="hl-reserved">if</span><span class="hl-code"> </span><span class="hl-identifier">letter</span><span class="hl-code"> == </span><span class="hl-quotes">'</span><span class="hl-string">b</span><span class="hl-quotes">'</span><span class="hl-code">:
      </span><span class="hl-reserved">break</span><span class="hl-code">
   </span><span class="hl-identifier">print</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">当前字母为 :</span><span class="hl-quotes">'</span><span class="hl-code">, </span><span class="hl-identifier">letter</span><span class="hl-brackets">)</span><span class="hl-code">
  
</span><span class="hl-identifier">var</span><span class="hl-code"> = </span><span class="hl-number">10</span><span class="hl-code">                    </span><span class="hl-comment"># 第二个实例</span><span class="hl-code">
</span><span class="hl-reserved">while</span><span class="hl-code"> </span><span class="hl-identifier">var</span><span class="hl-code"> &gt; </span><span class="hl-number">0</span><span class="hl-code">:              
   </span><span class="hl-identifier">print</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">当前变量值为 :</span><span class="hl-quotes">'</span><span class="hl-code">, </span><span class="hl-identifier">var</span><span class="hl-brackets">)</span><span class="hl-code">
   </span><span class="hl-identifier">var</span><span class="hl-code"> = </span><span class="hl-identifier">var</span><span class="hl-code"> -</span><span class="hl-number">1</span><span class="hl-code">
   </span><span class="hl-reserved">if</span><span class="hl-code"> </span><span class="hl-identifier">var</span><span class="hl-code"> == </span><span class="hl-number">5</span><span class="hl-code">:
      </span><span class="hl-reserved">break</span><span class="hl-code">
 
</span><span class="hl-identifier">print</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-quotes">"</span><span class="hl-string">Good bye!</span><span class="hl-quotes">"</span><span class="hl-brackets">)</span></div>
<button class="copy-code-button" type="button" data-clipboard-text="#!/usr/bin/python3
 
for letter in &#39;Runoob&#39;:     # 第一个实例
   if letter == &#39;b&#39;:
      break
   print (&#39;当前字母为 :&#39;, letter)
  
var = 10                    # 第二个实例
while var &gt; 0:              
   print (&#39;当前变量值为 :&#39;, var)
   var = var -1
   if var == 5:
      break
 
print (&quot;Good bye!&quot;)"></button></div>
</div>
<p>执行以上脚本输出结果为：</p>
<pre class="prettyprint prettyprinted" style=""><span class="pun">当前字母为</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> R
</span><span class="pun">当前字母为</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> u
</span><span class="pun">当前字母为</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> n
</span><span class="pun">当前字母为</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> o
</span><span class="pun">当前字母为</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> o
</span><span class="pun">当前变量值为</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> </span><span class="lit">10</span><span class="pln">
</span><span class="pun">当前变量值为</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> </span><span class="lit">9</span><span class="pln">
</span><span class="pun">当前变量值为</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> </span><span class="lit">8</span><span class="pln">
</span><span class="pun">当前变量值为</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> </span><span class="lit">7</span><span class="pln">
</span><span class="pun">当前变量值为</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> </span><span class="lit">6</span><span class="pln">
</span><span class="typ">Good</span><span class="pln"> bye</span><span class="pun">!</span><button class="copy-code-button" type="button" data-clipboard-text="当前字母为 : R
当前字母为 : u
当前字母为 : n
当前字母为 : o
当前字母为 : o
当前变量值为 : 10
当前变量值为 : 9
当前变量值为 : 8
当前变量值为 : 7
当前变量值为 : 6
Good bye!
"></button></pre>


<p>以下实例循环字符串 Runoob，碰到字母 o 跳过输出：
</p><div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-comment">#!/usr/bin/python3</span><span class="hl-code">
 
</span><span class="hl-reserved">for</span><span class="hl-code"> </span><span class="hl-identifier">letter</span><span class="hl-code"> </span><span class="hl-reserved">in</span><span class="hl-code"> </span><span class="hl-quotes">'</span><span class="hl-string">Runoob</span><span class="hl-quotes">'</span><span class="hl-code">:     </span><span class="hl-comment"># 第一个实例</span><span class="hl-code">
   </span><span class="hl-reserved">if</span><span class="hl-code"> </span><span class="hl-identifier">letter</span><span class="hl-code"> == </span><span class="hl-quotes">'</span><span class="hl-string">o</span><span class="hl-quotes">'</span><span class="hl-code">:        </span><span class="hl-comment"># 字母为 o 时跳过输出</span><span class="hl-code">
      </span><span class="hl-reserved">continue</span><span class="hl-code">
   </span><span class="hl-identifier">print</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">当前字母 :</span><span class="hl-quotes">'</span><span class="hl-code">, </span><span class="hl-identifier">letter</span><span class="hl-brackets">)</span><span class="hl-code">
 
</span><span class="hl-identifier">var</span><span class="hl-code"> = </span><span class="hl-number">10</span><span class="hl-code">                    </span><span class="hl-comment"># 第二个实例</span><span class="hl-code">
</span><span class="hl-reserved">while</span><span class="hl-code"> </span><span class="hl-identifier">var</span><span class="hl-code"> &gt; </span><span class="hl-number">0</span><span class="hl-code">:              
   </span><span class="hl-identifier">var</span><span class="hl-code"> = </span><span class="hl-identifier">var</span><span class="hl-code"> -</span><span class="hl-number">1</span><span class="hl-code">
   </span><span class="hl-reserved">if</span><span class="hl-code"> </span><span class="hl-identifier">var</span><span class="hl-code"> == </span><span class="hl-number">5</span><span class="hl-code">:             </span><span class="hl-comment"># 变量为 5 时跳过输出</span><span class="hl-code">
      </span><span class="hl-reserved">continue</span><span class="hl-code">
   </span><span class="hl-identifier">print</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">当前变量值 :</span><span class="hl-quotes">'</span><span class="hl-code">, </span><span class="hl-identifier">var</span><span class="hl-brackets">)</span><span class="hl-code">
</span><span class="hl-identifier">print</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-quotes">"</span><span class="hl-string">Good bye!</span><span class="hl-quotes">"</span><span class="hl-brackets">)</span></div>
<button class="copy-code-button" type="button" data-clipboard-text="#!/usr/bin/python3
 
for letter in &#39;Runoob&#39;:     # 第一个实例
   if letter == &#39;o&#39;:        # 字母为 o 时跳过输出
      continue
   print (&#39;当前字母 :&#39;, letter)
 
var = 10                    # 第二个实例
while var &gt; 0:              
   var = var -1
   if var == 5:             # 变量为 5 时跳过输出
      continue
   print (&#39;当前变量值 :&#39;, var)
print (&quot;Good bye!&quot;)"></button></div>
</div>
<p>执行以上脚本输出结果为：</p>
<pre class="prettyprint prettyprinted" style=""><span class="pun">当前字母</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> R
</span><span class="pun">当前字母</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> u
</span><span class="pun">当前字母</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> n
</span><span class="pun">当前字母</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> b
</span><span class="pun">当前变量值</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> </span><span class="lit">9</span><span class="pln">
</span><span class="pun">当前变量值</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> </span><span class="lit">8</span><span class="pln">
</span><span class="pun">当前变量值</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> </span><span class="lit">7</span><span class="pln">
</span><span class="pun">当前变量值</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> </span><span class="lit">6</span><span class="pln">
</span><span class="pun">当前变量值</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> </span><span class="lit">4</span><span class="pln">
</span><span class="pun">当前变量值</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> </span><span class="lit">3</span><span class="pln">
</span><span class="pun">当前变量值</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> </span><span class="lit">2</span><span class="pln">
</span><span class="pun">当前变量值</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> </span><span class="lit">1</span><span class="pln">
</span><span class="pun">当前变量值</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> </span><span class="lit">0</span><span class="pln">
</span><span class="typ">Good</span><span class="pln"> bye</span><span class="pun">!</span><button class="copy-code-button" type="button" data-clipboard-text="当前字母 : R
当前字母 : u
当前字母 : n
当前字母 : b
当前变量值 : 9
当前变量值 : 8
当前变量值 : 7
当前变量值 : 6
当前变量值 : 4
当前变量值 : 3
当前变量值 : 2
当前变量值 : 1
当前变量值 : 0
Good bye!
"></button></pre>
<p>循环语句可以有 else 子句，它在穷尽列表(以for循环)或条件变为 false (以while循环)导致循环终止时被执行，但循环被 break 终止时不执行。
</p>
<p>
如下实例用于查询质数的循环例子:</p>
<div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-comment">#!/usr/bin/python3</span><span class="hl-code">
 
</span><span class="hl-reserved">for</span><span class="hl-code"> </span><span class="hl-identifier">n</span><span class="hl-code"> </span><span class="hl-reserved">in</span><span class="hl-code"> </span><span class="hl-builtin">range</span><span class="hl-brackets">(</span><span class="hl-number">2</span><span class="hl-code">, </span><span class="hl-number">10</span><span class="hl-brackets">)</span><span class="hl-code">:
    </span><span class="hl-reserved">for</span><span class="hl-code"> </span><span class="hl-identifier">x</span><span class="hl-code"> </span><span class="hl-reserved">in</span><span class="hl-code"> </span><span class="hl-builtin">range</span><span class="hl-brackets">(</span><span class="hl-number">2</span><span class="hl-code">, </span><span class="hl-identifier">n</span><span class="hl-brackets">)</span><span class="hl-code">:
        </span><span class="hl-reserved">if</span><span class="hl-code"> </span><span class="hl-identifier">n</span><span class="hl-code"> % </span><span class="hl-identifier">x</span><span class="hl-code"> == </span><span class="hl-number">0</span><span class="hl-code">:
            </span><span class="hl-identifier">print</span><span class="hl-brackets">(</span><span class="hl-identifier">n</span><span class="hl-code">, </span><span class="hl-quotes">'</span><span class="hl-string">等于</span><span class="hl-quotes">'</span><span class="hl-code">, </span><span class="hl-identifier">x</span><span class="hl-code">, </span><span class="hl-quotes">'</span><span class="hl-string">*</span><span class="hl-quotes">'</span><span class="hl-code">, </span><span class="hl-identifier">n</span><span class="hl-code">//</span><span class="hl-identifier">x</span><span class="hl-brackets">)</span><span class="hl-code">
            </span><span class="hl-reserved">break</span><span class="hl-code">
    </span><span class="hl-reserved">else</span><span class="hl-code">:
        </span><span class="hl-comment"># 循环中没有找到元素</span><span class="hl-code">
        </span><span class="hl-identifier">print</span><span class="hl-brackets">(</span><span class="hl-identifier">n</span><span class="hl-code">, </span><span class="hl-quotes">'</span><span class="hl-string"> 是质数</span><span class="hl-quotes">'</span><span class="hl-brackets">)</span></div>
<button class="copy-code-button" type="button" data-clipboard-text="#!/usr/bin/python3
 
for n in range(2, 10):
    for x in range(2, n):
        if n % x == 0:
            print(n, &#39;等于&#39;, x, &#39;*&#39;, n//x)
            break
    else:
        # 循环中没有找到元素
        print(n, &#39; 是质数&#39;)"></button></div>
</div>
<p>执行以上脚本输出结果为：</p>
<pre class="prettyprint prettyprinted" style=""><span class="lit">2</span><span class="pln">  </span><span class="pun">是质数</span><span class="pln">
</span><span class="lit">3</span><span class="pln">  </span><span class="pun">是质数</span><span class="pln">
</span><span class="lit">4</span><span class="pln"> </span><span class="pun">等于</span><span class="pln"> </span><span class="lit">2</span><span class="pln"> </span><span class="pun">*</span><span class="pln"> </span><span class="lit">2</span><span class="pln">
</span><span class="lit">5</span><span class="pln">  </span><span class="pun">是质数</span><span class="pln">
</span><span class="lit">6</span><span class="pln"> </span><span class="pun">等于</span><span class="pln"> </span><span class="lit">2</span><span class="pln"> </span><span class="pun">*</span><span class="pln"> </span><span class="lit">3</span><span class="pln">
</span><span class="lit">7</span><span class="pln">  </span><span class="pun">是质数</span><span class="pln">
</span><span class="lit">8</span><span class="pln"> </span><span class="pun">等于</span><span class="pln"> </span><span class="lit">2</span><span class="pln"> </span><span class="pun">*</span><span class="pln"> </span><span class="lit">4</span><span class="pln">
</span><span class="lit">9</span><span class="pln"> </span><span class="pun">等于</span><span class="pln"> </span><span class="lit">3</span><span class="pln"> </span><span class="pun">*</span><span class="pln"> </span><span class="lit">3</span><button class="copy-code-button" type="button" data-clipboard-text="2  是质数
3  是质数
4 等于 2 * 2
5  是质数
6 等于 2 * 3
7  是质数
8 等于 2 * 4
9 等于 3 * 3
"></button></pre>


<hr>
<h2>pass 语句</h2>
<p>Python pass是空语句，是为了保持程序结构的完整性。</p>
<p>pass 不做任何事情，一般用做占位语句，如下实例</p>
<div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-code">&gt;&gt;&gt;</span><span class="hl-reserved">while</span><span class="hl-code"> </span><span class="hl-reserved">True</span><span class="hl-code">:
...     </span><span class="hl-reserved">pass</span><span class="hl-code">  </span><span class="hl-comment"># 等待键盘中断 (Ctrl+C)</span></div>
<button class="copy-code-button" type="button" data-clipboard-text="&gt;&gt;&gt;while True:
...     pass  # 等待键盘中断 (Ctrl+C)"></button></div>
</div>
<p>最小的类:</p>
<div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-code">&gt;&gt;&gt;</span><span class="hl-reserved">class</span><span class="hl-code"> </span><span class="hl-identifier">MyEmptyClass</span><span class="hl-code">:
...     </span><span class="hl-reserved">pass</span></div>
<button class="copy-code-button" type="button" data-clipboard-text="&gt;&gt;&gt;class MyEmptyClass:
...     pass"></button></div>
</div>
<p>以下实例在字母为 o 时 执行 pass 语句块:</p>
<div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-comment">#!/usr/bin/python3</span><span class="hl-code">
 
</span><span class="hl-reserved">for</span><span class="hl-code"> </span><span class="hl-identifier">letter</span><span class="hl-code"> </span><span class="hl-reserved">in</span><span class="hl-code"> </span><span class="hl-quotes">'</span><span class="hl-string">Runoob</span><span class="hl-quotes">'</span><span class="hl-code">: 
   </span><span class="hl-reserved">if</span><span class="hl-code"> </span><span class="hl-identifier">letter</span><span class="hl-code"> == </span><span class="hl-quotes">'</span><span class="hl-string">o</span><span class="hl-quotes">'</span><span class="hl-code">:
      </span><span class="hl-reserved">pass</span><span class="hl-code">
      </span><span class="hl-identifier">print</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">执行 pass 块</span><span class="hl-quotes">'</span><span class="hl-brackets">)</span><span class="hl-code">
   </span><span class="hl-identifier">print</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">当前字母 :</span><span class="hl-quotes">'</span><span class="hl-code">, </span><span class="hl-identifier">letter</span><span class="hl-brackets">)</span><span class="hl-code">
 
</span><span class="hl-identifier">print</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-quotes">"</span><span class="hl-string">Good bye!</span><span class="hl-quotes">"</span><span class="hl-brackets">)</span></div>
<button class="copy-code-button" type="button" data-clipboard-text="#!/usr/bin/python3
 
for letter in &#39;Runoob&#39;: 
   if letter == &#39;o&#39;:
      pass
      print (&#39;执行 pass 块&#39;)
   print (&#39;当前字母 :&#39;, letter)
 
print (&quot;Good bye!&quot;)" style="display: none;"></button></div>
</div>
<p>执行以上脚本输出结果为：</p>
<pre class="prettyprint prettyprinted" style=""><span class="pun">当前字母</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> R
</span><span class="pun">当前字母</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> u
</span><span class="pun">当前字母</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> n
</span><span class="pun">执行</span><span class="pln"> </span><span class="kwd">pass</span><span class="pln"> </span><span class="pun">块</span><span class="pln">
</span><span class="pun">当前字母</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> o
</span><span class="pun">执行</span><span class="pln"> </span><span class="kwd">pass</span><span class="pln"> </span><span class="pun">块</span><span class="pln">
</span><span class="pun">当前字母</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> o
</span><span class="pun">当前字母</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> b
</span><span class="typ">Good</span><span class="pln"> bye</span><span class="pun">!</span><button class="copy-code-button" type="button" data-clipboard-text="当前字母 : R
当前字母 : u
当前字母 : n
执行 pass 块
当前字母 : o
执行 pass 块
当前字母 : o
当前字母 : b
Good bye!
" style="display: none;"></button></pre>			<!-- 其他扩展 -->
			<hr>

<div id="quiz" class="quiz-container quiz-start-state">
  <div id="quiz-start-screen">
    <p><a href="https://www.runoob.com/python3/python3-loop.html#" id="quiz-start-btn" class="quiz-button">课后练习</a></p>
  </div>
<div id="quiz-counter" style="display: none;"></div><div id="questions"><div class="question-container" style="display: none;"><p class="question"></p><pre class="prettyprint prettyprinted" style=""><span class="kwd">if</span><span class="pln"> </span><span class="kwd">None</span><span class="pun">:</span><span class="pln">
    </span><span class="kwd">print</span><span class="pun">(“</span><span class="typ">Hello</span><span class="pun">”)</span><button class="copy-code-button" type="button" data-clipboard-text="if None:
    print(“Hello”)
"></button></pre><p>以上代码输出的结果是？</p><p></p><ul class="answers"><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="0">False</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="1">Hello</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="2">没有任何输出</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="3">语法错误</a></li></ul></div><div class="question-container" style="display: none;"><p class="question">在 if...elif...else 的多个语句块中只会执行一个语句块？</p><ul class="answers"><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="0">正确。</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="1">错误。</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="2">根据条件决定。</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="3">Pyhton 中没有 elif 语句。</a></li></ul></div><div class="question-container" style="display: none;"><p class="question"></p><pre class="prettyprint prettyprinted" style=""><span class="kwd">for</span><span class="pln"> i </span><span class="kwd">in</span><span class="pln"> </span><span class="pun">[</span><span class="lit">1</span><span class="pun">,</span><span class="pln"> </span><span class="lit">0</span><span class="pun">]:</span><span class="pln">
    </span><span class="kwd">print</span><span class="pun">(</span><span class="pln">i</span><span class="pun">+</span><span class="lit">1</span><span class="pun">)</span><button class="copy-code-button" type="button" data-clipboard-text="for i in [1, 0]:
    print(i+1)
"></button></pre><p>以上代码输出结果为？</p><p></p><ul class="answers"><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="0">2<br>1</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="1">[2, 1]</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="2">2</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="3">0</a></li></ul></div><div class="question-container" style="display: none;"><p class="question">Python 中，for 和 while 可以有 else 语句？</p><ul class="answers"><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="0">只有 for 才有 else 语句。</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="1">只有 while 才有 else 语句。</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="2">for 和 while 都可以有 else 语句。</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="3">for 和 while 都没有 else 语句。</a></li></ul></div><div class="question-container" style="display: none;"><p class="question"></p><pre class="prettyprint prettyprinted" style=""><span class="pln">i </span><span class="pun">=</span><span class="pln"> sum </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pln">

</span><span class="kwd">while</span><span class="pln"> i </span><span class="pun">&lt;=</span><span class="pln"> </span><span class="lit">4</span><span class="pun">:</span><span class="pln">
    sum </span><span class="pun">+=</span><span class="pln"> i
    i </span><span class="pun">=</span><span class="pln"> i</span><span class="pun">+</span><span class="lit">1</span><span class="pln">

</span><span class="kwd">print</span><span class="pun">(</span><span class="pln">sum</span><span class="pun">)</span><button class="copy-code-button" type="button" data-clipboard-text="i = sum = 0

while i &lt;= 4:
    sum += i
    i = i+1

print(sum)
"></button></pre><p>以上代码输出的结果是？</p><p></p><ul class="answers"><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="0">0</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="1">10</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="2">4</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="3">以上结果都不对。</a></li></ul></div><div class="question-container" style="display: none;"><p class="question"></p><pre class="prettyprint prettyprinted" style=""><span class="kwd">while</span><span class="pln"> </span><span class="lit">4</span><span class="pln"> </span><span class="pun">==</span><span class="pln"> </span><span class="lit">4</span><span class="pun">:</span><span class="pln">
    </span><span class="kwd">print</span><span class="pun">(</span><span class="str">'4'</span><span class="pun">)</span><button class="copy-code-button" type="button" data-clipboard-text="while 4 == 4:
    print(&#39;4&#39;)
"></button></pre><p>以上代码输出的结果是？</p><p></p><ul class="answers"><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="0">输出一次 4。</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="1">输出四次 4。</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="2">无限次输出 4，直到程序关闭。</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="3">语法错误。</a></li></ul></div><div class="question-container" style="display: none;"><p class="question">迭代输出序列时（如：列表）使用 for 比 while 更好？</p><ul class="answers"><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="0">错误，while 比 for 更好。</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="1">正确</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="2">错误，while 不能用于迭代系列。</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="3">错误，for 和 while 都不能用于迭代系列。</a></li></ul></div><div class="question-container" style="display: none;"><p class="question">以下哪个描述是正确的？</p><ul class="answers"><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="0">break 语句用于终止当前循环。</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="1">continue 语句用于跳过当前剩余要执行的代码，执行下一次循环。</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="2">break 和 continue 语句通常与  if, if...else 和 if...elif...else 语句一起使用。</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="3">以上说法都是正确的。</a></li></ul></div><div class="question-container" style="display: none;"><p class="question"></p><pre class="prettyprint prettyprinted" style=""><span class="kwd">for</span><span class="pln"> </span><span class="kwd">char</span><span class="pln"> </span><span class="kwd">in</span><span class="pln"> </span><span class="str">'PYTHON STRING'</span><span class="pun">:</span><span class="pln">
  </span><span class="kwd">if</span><span class="pln"> </span><span class="kwd">char</span><span class="pln"> </span><span class="pun">==</span><span class="pln"> </span><span class="str">' '</span><span class="pun">:</span><span class="pln">
      </span><span class="kwd">break</span><span class="pln">

  </span><span class="kwd">print</span><span class="pun">(</span><span class="kwd">char</span><span class="pun">,</span><span class="pln"> </span><span class="kwd">end</span><span class="pun">=</span><span class="str">''</span><span class="pun">)</span><span class="pln">
  
  </span><span class="kwd">if</span><span class="pln"> </span><span class="kwd">char</span><span class="pln"> </span><span class="pun">==</span><span class="pln"> </span><span class="str">'O'</span><span class="pun">:</span><span class="pln">
      </span><span class="kwd">continue</span><button class="copy-code-button" type="button" data-clipboard-text="for char in &#39;PYTHON STRING&#39;:
  if char == &#39; &#39;:
      break

  print(char, end=&#39;&#39;)
  
  if char == &#39;O&#39;:
      continue
"></button></pre><p>以上代码输出的结果是？</p><p></p><ul class="answers"><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="0">PYTHON</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="1">PYTHONSTRING</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="2">PYTHN</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="3">STRING</a></li></ul></div><div class="question-container" style="display: none;"><p class="question">以下关于 pass 哪个描述是正确的？</p><ul class="answers"><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="0">Python 会忽略 pass 语句，就像忽略注释一样。</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="1">pass 语句会终止当前循环。</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="2">pass 不做任何事情，一般用做占位语句。</a></li><li><a href="https://www.runoob.com/python3/python3-loop.html#" data-index="3">以上说法都是正确的。</a></li></ul></div></div><div id="quiz-results-screen" style="display: none;"><p id="quiz-results"></p></div><div id="quiz-controls" style="display: none;"><p id="quiz-response"></p><div id="quiz-buttons"><a href="https://www.runoob.com/python3/python3-loop.html#" id="quiz-next-btn">下一题</a><a href="https://www.runoob.com/python3/python3-loop.html#" id="quiz-finish-btn">完成</a><a href="https://www.runoob.com/python3/python3-loop.html#" id="quiz-restart-btn">重新测验</a></div></div></div>
<pre id="py-qa-1" style="display:none;" class="prettyprint prettyprinted"><span class="kwd">if</span><span class="pln"> </span><span class="kwd">None</span><span class="pun">:</span><span class="pln">
    </span><span class="kwd">print</span><span class="pun">(“</span><span class="typ">Hello</span><span class="pun">”)</span><button class="copy-code-button" type="button" data-clipboard-text="if None:
    print(“Hello”)
"></button></pre>
<pre id="py-qa-2" style="display:none;" class="prettyprint prettyprinted"><span class="kwd">for</span><span class="pln"> i </span><span class="kwd">in</span><span class="pln"> </span><span class="pun">[</span><span class="lit">1</span><span class="pun">,</span><span class="pln"> </span><span class="lit">0</span><span class="pun">]:</span><span class="pln">
    </span><span class="kwd">print</span><span class="pun">(</span><span class="pln">i</span><span class="pun">+</span><span class="lit">1</span><span class="pun">)</span><button class="copy-code-button" type="button" data-clipboard-text="for i in [1, 0]:
    print(i+1)
"></button></pre>
<pre id="py-qa-3" style="display:none;" class="prettyprint prettyprinted"><span class="pln">i </span><span class="pun">=</span><span class="pln"> sum </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pln">

</span><span class="kwd">while</span><span class="pln"> i </span><span class="pun">&lt;=</span><span class="pln"> </span><span class="lit">4</span><span class="pun">:</span><span class="pln">
    sum </span><span class="pun">+=</span><span class="pln"> i
    i </span><span class="pun">=</span><span class="pln"> i</span><span class="pun">+</span><span class="lit">1</span><span class="pln">

</span><span class="kwd">print</span><span class="pun">(</span><span class="pln">sum</span><span class="pun">)</span><button class="copy-code-button" type="button" data-clipboard-text="i = sum = 0

while i &lt;= 4:
    sum += i
    i = i+1

print(sum)
"></button></pre>
<pre id="py-qa-4" style="display:none;" class="prettyprint prettyprinted"><span class="kwd">while</span><span class="pln"> </span><span class="lit">4</span><span class="pln"> </span><span class="pun">==</span><span class="pln"> </span><span class="lit">4</span><span class="pun">:</span><span class="pln">
    </span><span class="kwd">print</span><span class="pun">(</span><span class="str">'4'</span><span class="pun">)</span><button class="copy-code-button" type="button" data-clipboard-text="while 4 == 4:
    print(&#39;4&#39;)
"></button></pre>
<pre id="py-qa-5" style="display:none;" class="prettyprint prettyprinted"><span class="kwd">for</span><span class="pln"> </span><span class="kwd">char</span><span class="pln"> </span><span class="kwd">in</span><span class="pln"> </span><span class="str">'PYTHON STRING'</span><span class="pun">:</span><span class="pln">
  </span><span class="kwd">if</span><span class="pln"> </span><span class="kwd">char</span><span class="pln"> </span><span class="pun">==</span><span class="pln"> </span><span class="str">' '</span><span class="pun">:</span><span class="pln">
      </span><span class="kwd">break</span><span class="pln">

  </span><span class="kwd">print</span><span class="pun">(</span><span class="kwd">char</span><span class="pun">,</span><span class="pln"> </span><span class="kwd">end</span><span class="pun">=</span><span class="str">''</span><span class="pun">)</span><span class="pln">
  
  </span><span class="kwd">if</span><span class="pln"> </span><span class="kwd">char</span><span class="pln"> </span><span class="pun">==</span><span class="pln"> </span><span class="str">'O'</span><span class="pun">:</span><span class="pln">
      </span><span class="kwd">continue</span><button class="copy-code-button" type="button" data-clipboard-text="for char in &#39;PYTHON STRING&#39;:
  if char == &#39; &#39;:
      break

  print(char, end=&#39;&#39;)
  
  if char == &#39;O&#39;:
      continue
"></button></pre>
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	<ol class="commentlist">
		<li class="comment byuser comment-author-tianqixin bypostauthor even thread-even depth-1" id="comment-1050"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;tianqixin</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;429***967@qq.com</p><p><i class="fa fa-external-link" aria-hidden="true"></i> <a rel="nofollow" target="_blank" href="http://www.runoob.com/">&nbsp;&nbsp;参考地址</a></p></div><div id="runoobvote-id-1050" data-commid="1050" class="upvotejs upvotejs-enabled"><a class="upvote"></a> <span class="count">193</span></div></div><div class="comt-main" id="div-comment-1050"><p>使用内置 enumerate 函数进行遍历:</p>
<pre class="prettyprint prettyprinted" style=""><span class="kwd">for</span><span class="pln"> index</span><span class="pun">,</span><span class="pln"> item </span><span class="kwd">in</span><span class="pln"> enumerate</span><span class="pun">(</span><span class="pln">sequence</span><span class="pun">):</span><span class="pln">
    process</span><span class="pun">(</span><span class="pln">index</span><span class="pun">,</span><span class="pln"> item</span><span class="pun">)</span><button class="copy-code-button" type="button" data-clipboard-text="for index, item in enumerate(sequence):
    process(index, item)
"></button></pre>
<h2>实例</h2>
<pre class="prettyprint prettyprinted" style=""><span class="pun">&gt;&gt;&gt;</span><span class="pln"> sequence </span><span class="pun">=</span><span class="pln"> </span><span class="pun">[</span><span class="lit">12</span><span class="pun">,</span><span class="pln"> </span><span class="lit">34</span><span class="pun">,</span><span class="pln"> </span><span class="lit">34</span><span class="pun">,</span><span class="pln"> </span><span class="lit">23</span><span class="pun">,</span><span class="pln"> </span><span class="lit">45</span><span class="pun">,</span><span class="pln"> </span><span class="lit">76</span><span class="pun">,</span><span class="pln"> </span><span class="lit">89</span><span class="pun">]</span><span class="pln">
</span><span class="pun">&gt;&gt;&gt;</span><span class="pln"> </span><span class="kwd">for</span><span class="pln"> i</span><span class="pun">,</span><span class="pln"> j </span><span class="kwd">in</span><span class="pln"> enumerate</span><span class="pun">(</span><span class="pln">sequence</span><span class="pun">):</span><span class="pln">
</span><span class="pun">...</span><span class="pln">     </span><span class="kwd">print</span><span class="pun">(</span><span class="pln">i</span><span class="pun">,</span><span class="pln"> j</span><span class="pun">)</span><span class="pln">
</span><span class="pun">...</span><span class="pln"> 
</span><span class="lit">0</span><span class="pln"> </span><span class="lit">12</span><span class="pln">
</span><span class="lit">1</span><span class="pln"> </span><span class="lit">34</span><span class="pln">
</span><span class="lit">2</span><span class="pln"> </span><span class="lit">34</span><span class="pln">
</span><span class="lit">3</span><span class="pln"> </span><span class="lit">23</span><span class="pln">
</span><span class="lit">4</span><span class="pln"> </span><span class="lit">45</span><span class="pln">
</span><span class="lit">5</span><span class="pln"> </span><span class="lit">76</span><span class="pln">
</span><span class="lit">6</span><span class="pln"> </span><span class="lit">89</span><button class="copy-code-button" type="button" data-clipboard-text="&gt;&gt;&gt; sequence = [12, 34, 34, 23, 45, 76, 89]
&gt;&gt;&gt; for i, j in enumerate(sequence):
...     print(i, j)
... 
0 12
1 34
2 34
3 23
4 45
5 76
6 89
"></button></pre><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">tianqixin</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;tianqixin</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;429***967@qq.com</p><p><i class="fa fa-external-link" aria-hidden="true"></i> <a rel="nofollow" target="_blank" href="http://www.runoob.com/">&nbsp;&nbsp;参考地址</a></p></div></span>7年前 (2017-02-27)</div></div></li><!-- #comment-## -->
<li class="comment odd alt thread-odd thread-alt depth-1" id="comment-12971"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;夏木研</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;104***4137@qq.com</p></div><div id="runoobvote-id-12971" data-commid="12971" class="upvotejs upvotejs-enabled"><a class="upvote"></a> <span class="count">49</span></div></div><div class="comt-main" id="div-comment-12971"><p>
for 循环 1-100 所有整数的和
</p><pre class="prettyprint prettyprinted" style=""><span class="com">#!/usr/bin/env python3</span><span class="pln">

n </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pln">
sum </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pln">
</span><span class="kwd">for</span><span class="pln"> n </span><span class="kwd">in</span><span class="pln"> range</span><span class="pun">(</span><span class="lit">0</span><span class="pun">,</span><span class="lit">101</span><span class="pun">):#</span><span class="pln"> n </span><span class="pun">范围</span><span class="pln"> </span><span class="lit">0</span><span class="pun">-</span><span class="lit">100</span><span class="pln">
    sum </span><span class="pun">+=</span><span class="pln"> n
</span><span class="kwd">print</span><span class="pun">(</span><span class="pln">sum</span><span class="pun">)</span><button class="copy-code-button" type="button" data-clipboard-text="#!/usr/bin/env python3

n = 0
sum = 0
for n in range(0,101):# n 范围 0-100
    sum += n
print(sum)
"></button></pre><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">夏木研</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;夏木研</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;104***4137@qq.com</p></div></span>7年前 (2017-06-14)</div></div></li><!-- #comment-## -->
<li class="comment byuser comment-author-tianqixin bypostauthor even thread-even depth-1" id="comment-13127"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;zero</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;562***402@QQ.COM</p></div><div id="runoobvote-id-13127" data-commid="13127" class="upvotejs upvotejs-enabled"><a class="upvote"></a> <span class="count">114</span></div></div><div class="comt-main" id="div-comment-13127"><p>使用循环嵌套来实现99乘法法则:</p>
<pre class="prettyprint prettyprinted" style=""><span class="com">#!/usr/bin/python3</span><span class="pln">

</span><span class="com">#外边一层循环控制行数</span><span class="pln">
</span><span class="com">#i是行数</span><span class="pln">
i</span><span class="pun">=</span><span class="lit">1</span><span class="pln">
</span><span class="kwd">while</span><span class="pln"> i</span><span class="pun">&lt;=</span><span class="lit">9</span><span class="pun">:</span><span class="pln">
     </span><span class="com">#里面一层循环控制每一行中的列数</span><span class="pln">
     j</span><span class="pun">=</span><span class="lit">1</span><span class="pln">
     </span><span class="kwd">while</span><span class="pln"> j</span><span class="pun">&lt;=</span><span class="pln">i</span><span class="pun">:</span><span class="pln">
          mut </span><span class="pun">=</span><span class="pln">j</span><span class="pun">*</span><span class="pln">i
          </span><span class="kwd">print</span><span class="pun">(</span><span class="str">"%d*%d=%d"</span><span class="pun">%(</span><span class="pln">j</span><span class="pun">,</span><span class="pln">i</span><span class="pun">,</span><span class="pln">mut</span><span class="pun">),</span><span class="pln"> </span><span class="kwd">end</span><span class="pun">=</span><span class="str">"  "</span><span class="pun">)</span><span class="pln">
          j</span><span class="pun">+=</span><span class="lit">1</span><span class="pln">
     </span><span class="kwd">print</span><span class="pun">(</span><span class="str">""</span><span class="pun">)</span><span class="pln">
     i</span><span class="pun">+=</span><span class="lit">1</span><button class="copy-code-button" type="button" data-clipboard-text="#!/usr/bin/python3

#外边一层循环控制行数
#i是行数
i=1
while i&lt;=9:
     #里面一层循环控制每一行中的列数
     j=1
     while j&lt;=i:
          mut =j*i
          print(&quot;%d*%d=%d&quot;%(j,i,mut), end=&quot;  &quot;)
          j+=1
     print(&quot;&quot;)
     i+=1
"></button></pre><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">zero</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;zero</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;562***402@QQ.COM</p></div></span>7年前 (2017-06-19)</div></div></li><!-- #comment-## -->
<li class="comment byuser comment-author-tianqixin bypostauthor odd alt thread-odd thread-alt depth-1" id="comment-13877"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;Micachen</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;811***747@qq.com</p></div><div id="runoobvote-id-13877" data-commid="13877" class="upvotejs upvotejs-enabled"><a class="upvote"></a> <span class="count">29</span></div></div><div class="comt-main" id="div-comment-13877"><p>for 循环的嵌套使用实例：</p>
<pre class="prettyprint prettyprinted" style=""><span class="com">#!/usr/bin/python3</span><span class="pln">

</span><span class="kwd">for</span><span class="pln"> i </span><span class="kwd">in</span><span class="pln"> range</span><span class="pun">(</span><span class="lit">1</span><span class="pun">,</span><span class="lit">6</span><span class="pun">):</span><span class="pln">
   </span><span class="kwd">for</span><span class="pln"> j </span><span class="kwd">in</span><span class="pln"> range</span><span class="pun">(</span><span class="lit">1</span><span class="pun">,</span><span class="pln"> i</span><span class="pun">+</span><span class="lit">1</span><span class="pun">):</span><span class="pln">
      </span><span class="kwd">print</span><span class="pun">(</span><span class="str">"*"</span><span class="pun">,</span><span class="kwd">end</span><span class="pun">=</span><span class="str">''</span><span class="pun">)</span><span class="pln">
   </span><span class="kwd">print</span><span class="pun">(</span><span class="str">'\r'</span><span class="pun">)</span><button class="copy-code-button" type="button" data-clipboard-text="#!/usr/bin/python3

for i in range(1,6):
   for j in range(1, i+1):
      print(&quot;*&quot;,end=&#39;&#39;)
   print(&#39;\r&#39;)"></button></pre>
<p>
输出结果：
</p><pre class="prettyprint prettyprinted" style=""><span class="pun">*</span><span class="pln">
</span><span class="pun">**</span><span class="pln">
</span><span class="pun">***</span><span class="pln">
</span><span class="pun">****</span><span class="pln">
</span><span class="pun">*****</span><button class="copy-code-button" type="button" data-clipboard-text="*
**
***
****
*****"></button></pre><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">Micachen</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;Micachen</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;811***747@qq.com</p></div></span>7年前 (2017-07-10)</div></div></li><!-- #comment-## -->
<li class="comment even thread-even depth-1" id="comment-15733"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;payboy</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;jk@***.com</p></div><div id="runoobvote-id-15733" data-commid="15733" class="upvotejs upvotejs-enabled"><a class="upvote"></a> <span class="count">227</span></div></div><div class="comt-main" id="div-comment-15733"><p>1-100 的和:</p>
<pre class="prettyprint prettyprinted" style=""><span class="pun">&gt;&gt;&gt;</span><span class="pln"> sum</span><span class="pun">(</span><span class="pln">range</span><span class="pun">(</span><span class="lit">101</span><span class="pun">))</span><span class="pln">
</span><span class="lit">5050</span><button class="copy-code-button" type="button" data-clipboard-text="&gt;&gt;&gt; sum(range(101))
5050"></button></pre><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">payboy</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;payboy</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;jk@***.com</p></div></span>7年前 (2017-08-02)</div></div></li><!-- #comment-## -->
<li class="comment odd alt thread-odd thread-alt depth-1" id="comment-17443"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;Try</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;910***115@qq.com</p></div><div id="runoobvote-id-17443" data-commid="17443" class="upvotejs upvotejs-enabled"><a class="upvote"></a> <span class="count">130</span></div></div><div class="comt-main" id="div-comment-17443"><p>while 循环语句和 for 循环语句使用 else 的区别：</p><ul><li><i style="font-size:12px;color:#cfcfcf;padding-right: 4px;" class="fa fa-circle" aria-hidden="true"></i>1、如果 else 语句和 while 循环语句一起使用，则当条件变为 False 时，则执行 else 语句。</li><li><i style="font-size:12px;color:#cfcfcf;padding-right: 4px;" class="fa fa-circle" aria-hidden="true"></i>2.如果 else 语句和 for 循环语句一起使用，else 语句块只在 for 循环正常终止时执行！</li></ul><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">Try</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;Try</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;910***115@qq.com</p></div></span>7年前 (2017-09-12)</div></div></li><!-- #comment-## -->
<li class="comment even thread-even depth-1" id="comment-20486"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;在哪里学习就在哪里分享</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;dre***fjay@163.com</p></div><div id="runoobvote-id-20486" data-commid="20486" class="upvotejs upvotejs-enabled"><a class="upvote"></a> <span class="count">109</span></div></div><div class="comt-main" id="div-comment-20486"><p><strong>关于pass的作用：</strong></p>

<p>pass只是为了防止语法错误。</p>

<pre class="prettyprint prettyprinted" style=""><span class="kwd">if</span><span class="pln"> a</span><span class="pun">&gt;</span><span class="lit">1</span><span class="pun">:</span><span class="pln">
    </span><span class="kwd">pass</span><span class="pln"> </span><span class="com">#如果没有内容，可以先写pass，但是如果不写pass，就会语法错误</span><button class="copy-code-button" type="button" data-clipboard-text="if a&gt;1:
    pass #如果没有内容，可以先写pass，但是如果不写pass，就会语法错误"></button></pre>
<p>pass就是一条空语句。在代码段中或定义函数的时候，如果没有内容，或者先不做任何处理，直接跳过，就可以使用pass。</p><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">在哪里学习就在哪里分享</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;在哪里学习就在哪里分享</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;dre***fjay@163.com</p></div></span>7年前 (2017-11-18)</div></div></li><!-- #comment-## -->
<li class="comment odd alt thread-odd thread-alt depth-1" id="comment-21690"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;若能绽放光芒</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;740***128@qq.com</p></div><div id="runoobvote-id-21690" data-commid="21690" class="upvotejs upvotejs-enabled"><a class="upvote"></a> <span class="count">35</span></div></div><div class="comt-main" id="div-comment-21690"><pre class="prettyprint prettyprinted" style=""><span class="com">#十进制转化</span><span class="pln">

</span><span class="kwd">while</span><span class="pln"> </span><span class="kwd">True</span><span class="pun">:</span><span class="pln">
    number </span><span class="pun">=</span><span class="pln"> input</span><span class="pun">(</span><span class="str">'请输入一个整数(输入Q退出程序)：'</span><span class="pun">)</span><span class="pln"> 
    </span><span class="kwd">if</span><span class="pln"> number </span><span class="kwd">in</span><span class="pln"> </span><span class="pun">[</span><span class="str">'q'</span><span class="pun">,</span><span class="str">'Q'</span><span class="pun">]:</span><span class="pln">
        </span><span class="kwd">break</span><span class="pln">                </span><span class="com">#如果输入的是q或Q,结束退出</span><span class="pln">
    </span><span class="kwd">elif</span><span class="pln"> </span><span class="kwd">not</span><span class="pln"> number</span><span class="pun">.</span><span class="pln">isdigit</span><span class="pun">():</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">(</span><span class="str">'您的输入有误！只能输入整数(输入Q退出程序)！请重新输入'</span><span class="pun">)</span><span class="pln">
        </span><span class="kwd">continue</span><span class="pln">         </span><span class="com">#如果输入的数字不是十进制,结束循环,重新开始</span><span class="pln">
    </span><span class="kwd">else</span><span class="pln"> </span><span class="pun">:</span><span class="pln">
            number </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">int</span><span class="pun">(</span><span class="pln">number</span><span class="pun">)</span><span class="pln">
            </span><span class="kwd">print</span><span class="pun">(</span><span class="str">'十进制 --&gt; 十六进制 ：%d -&gt; 0x%x'</span><span class="pln"> </span><span class="pun">%(</span><span class="pln">number</span><span class="pun">,</span><span class="pln">number</span><span class="pun">))</span><span class="pln">
            </span><span class="kwd">print</span><span class="pun">(</span><span class="str">'十进制 --&gt;   八进制 ：%d -&gt; 0o%o'</span><span class="pln"> </span><span class="pun">%(</span><span class="pln">number</span><span class="pun">,</span><span class="pln">number</span><span class="pun">))</span><span class="pln">
            </span><span class="kwd">print</span><span class="pun">(</span><span class="str">'十进制 --&gt;   二进制 ：%d -&gt;'</span><span class="pun">%</span><span class="pln">number</span><span class="pun">,</span><span class="pln">bin</span><span class="pun">(</span><span class="pln">number</span><span class="pun">))</span><button class="copy-code-button" type="button" data-clipboard-text="#十进制转化

while True:
    number = input(&#39;请输入一个整数(输入Q退出程序)：&#39;) 
    if number in [&#39;q&#39;,&#39;Q&#39;]:
        break                #如果输入的是q或Q,结束退出
    elif not number.isdigit():
        print(&#39;您的输入有误！只能输入整数(输入Q退出程序)！请重新输入&#39;)
        continue         #如果输入的数字不是十进制,结束循环,重新开始
    else :
            number = int(number)
            print(&#39;十进制 --&gt; 十六进制 ：%d -&gt; 0x%x&#39; %(number,number))
            print(&#39;十进制 --&gt;   八进制 ：%d -&gt; 0o%o&#39; %(number,number))
            print(&#39;十进制 --&gt;   二进制 ：%d -&gt;&#39;%number,bin(number))"></button></pre><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">若能绽放光芒</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;若能绽放光芒</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;740***128@qq.com</p></div></span>7年前 (2017-12-15)</div></div></li><!-- #comment-## -->
<li class="comment even thread-even depth-1" id="comment-23865"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;HantCoCo</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;zco***@163.com</p></div><div id="runoobvote-id-23865" data-commid="23865" class="upvotejs upvotejs-enabled"><a class="upvote"></a> <span class="count">72</span></div></div><div class="comt-main" id="div-comment-23865"><p><strong>冒泡排序，python 版本</strong></p>

<p>解析：很经典的排序方式，从数组中的第0个元素开始，与后面一个元素进行比较，如果前面的元素大于后面的元素，就调换位置，循环到最后（即：a0与a1比较得到结果后，a1与a2比较...），最大的元素被换到数组最末尾，剔除掉最后一个元素，在余下的数组元素中进行上述操作，到最后，整个数组呈现从小到大的排序</p>

<pre class="prettyprint prettyprinted" style=""><span class="com"># python 冒泡排序</span><span class="pln">

</span><span class="kwd">def</span><span class="pln"> paixu</span><span class="pun">(</span><span class="pln">li</span><span class="pun">)</span><span class="pln"> </span><span class="pun">:</span><span class="pln">
    max </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pln">
    </span><span class="kwd">for</span><span class="pln"> ad </span><span class="kwd">in</span><span class="pln"> range</span><span class="pun">(</span><span class="pln">len</span><span class="pun">(</span><span class="pln">li</span><span class="pun">)</span><span class="pln"> </span><span class="pun">-</span><span class="pln"> </span><span class="lit">1</span><span class="pun">):</span><span class="pln">
        </span><span class="kwd">for</span><span class="pln"> x </span><span class="kwd">in</span><span class="pln"> range</span><span class="pun">(</span><span class="pln">len</span><span class="pun">(</span><span class="pln">li</span><span class="pun">)</span><span class="pln"> </span><span class="pun">-</span><span class="pln"> </span><span class="lit">1</span><span class="pln"> </span><span class="pun">-</span><span class="pln"> ad</span><span class="pun">):</span><span class="pln">
            </span><span class="kwd">if</span><span class="pln"> li</span><span class="pun">[</span><span class="pln">x</span><span class="pun">]</span><span class="pln"> </span><span class="pun">&gt;</span><span class="pln"> li</span><span class="pun">[</span><span class="pln">x </span><span class="pun">+</span><span class="pln"> </span><span class="lit">1</span><span class="pun">]:</span><span class="pln">
                max </span><span class="pun">=</span><span class="pln"> li</span><span class="pun">[</span><span class="pln">x</span><span class="pun">]</span><span class="pln">
                li</span><span class="pun">[</span><span class="pln">x</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> li</span><span class="pun">[</span><span class="pln">x </span><span class="pun">+</span><span class="pln"> </span><span class="lit">1</span><span class="pun">]</span><span class="pln">
                li</span><span class="pun">[</span><span class="pln">x </span><span class="pun">+</span><span class="pln"> </span><span class="lit">1</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> max
            </span><span class="kwd">else</span><span class="pun">:</span><span class="pln">
                max </span><span class="pun">=</span><span class="pln"> li</span><span class="pun">[</span><span class="pln">x </span><span class="pun">+</span><span class="pln"> </span><span class="lit">1</span><span class="pun">]</span><span class="pln">
    </span><span class="kwd">print</span><span class="pun">(</span><span class="pln">li</span><span class="pun">)</span><span class="pln">
paixu</span><span class="pun">([</span><span class="lit">41</span><span class="pun">,</span><span class="lit">23344</span><span class="pun">,</span><span class="lit">9353</span><span class="pun">,</span><span class="lit">5554</span><span class="pun">,</span><span class="lit">44</span><span class="pun">,</span><span class="lit">7557</span><span class="pun">,</span><span class="lit">6434</span><span class="pun">,</span><span class="lit">500</span><span class="pun">,</span><span class="lit">2000</span><span class="pun">])</span><button class="copy-code-button" type="button" data-clipboard-text="# python 冒泡排序

def paixu(li) :
    max = 0
    for ad in range(len(li) - 1):
        for x in range(len(li) - 1 - ad):
            if li[x] &gt; li[x + 1]:
                max = li[x]
                li[x] = li[x + 1]
                li[x + 1] = max
            else:
                max = li[x + 1]
    print(li)
paixu([41,23344,9353,5554,44,7557,6434,500,2000])"></button></pre>
<div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">HantCoCo</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;HantCoCo</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;zco***@163.com</p></div></span>6年前 (2018-02-05)</div></div></li><!-- #comment-## -->
<li class="comment byuser comment-author-tianqixin bypostauthor odd alt thread-odd thread-alt depth-1" id="comment-29691"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;jason</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;598***652@qq.com</p></div><div id="runoobvote-id-29691" data-commid="29691" class="upvotejs upvotejs-enabled"><a class="upvote"></a> <span class="count">43</span></div></div><div class="comt-main" id="div-comment-29691"><p><strong>猜拳小游戏</strong></p>
<pre class="prettyprint prettyprinted" style=""><span class="kwd">import</span><span class="pln"> random
</span><span class="kwd">while</span><span class="pln"> </span><span class="lit">1</span><span class="pun">:</span><span class="pln">
    s</span><span class="pun">=</span><span class="kwd">int</span><span class="pun">(</span><span class="pln">random</span><span class="pun">.</span><span class="pln">randint</span><span class="pun">(</span><span class="lit">1</span><span class="pun">,</span><span class="lit">3</span><span class="pun">))</span><span class="pln">
    </span><span class="kwd">if</span><span class="pln"> s</span><span class="pun">==</span><span class="lit">1</span><span class="pun">:</span><span class="pln">
        ind</span><span class="pun">=</span><span class="str">"石头"</span><span class="pln">
    </span><span class="kwd">elif</span><span class="pln"> s</span><span class="pun">==</span><span class="lit">2</span><span class="pun">:</span><span class="pln">
        ind</span><span class="pun">=</span><span class="str">"剪刀"</span><span class="pln">
    </span><span class="kwd">elif</span><span class="pln"> s</span><span class="pun">==</span><span class="lit">3</span><span class="pun">:</span><span class="pln">
        ind</span><span class="pun">=</span><span class="str">"布"</span><span class="pln"> 
    m</span><span class="pun">=</span><span class="pln">input</span><span class="pun">(</span><span class="str">'输入石头，剪刀，布，输入end结束游戏：'</span><span class="pun">)</span><span class="pln">
    
    blist</span><span class="pun">=[</span><span class="str">'石头'</span><span class="pun">,</span><span class="str">'剪刀'</span><span class="pun">,</span><span class="str">'布'</span><span class="pun">]</span><span class="pln">
    
    </span><span class="kwd">if</span><span class="pun">(</span><span class="pln">m </span><span class="kwd">not</span><span class="pln"> </span><span class="kwd">in</span><span class="pln"> blist</span><span class="pun">)</span><span class="pln"> </span><span class="kwd">and</span><span class="pln"> </span><span class="pun">(</span><span class="pln">m</span><span class="pun">!=</span><span class="str">'end'</span><span class="pun">):</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">(</span><span class="str">"输入错误，重试："</span><span class="pun">)</span><span class="pln">
    </span><span class="kwd">elif</span><span class="pun">(</span><span class="pln">m</span><span class="pun">==</span><span class="str">'end'</span><span class="pun">)</span><span class="kwd">and</span><span class="pun">(</span><span class="pln">m </span><span class="kwd">not</span><span class="pln"> </span><span class="kwd">in</span><span class="pln"> blist</span><span class="pun">):</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">(</span><span class="pln">ind</span><span class="pun">)</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">(</span><span class="str">"\n游戏退出"</span><span class="pun">)</span><span class="pln">
        </span><span class="kwd">break</span><span class="pln">
    </span><span class="kwd">elif</span><span class="pln"> m</span><span class="pun">==</span><span class="pln">ind</span><span class="pun">:</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">(</span><span class="str">"平"</span><span class="pun">)</span><span class="pln">
    </span><span class="kwd">elif</span><span class="pln"> </span><span class="pun">(</span><span class="pln">m </span><span class="pun">==</span><span class="pln"> </span><span class="str">'石头'</span><span class="pln"> </span><span class="kwd">and</span><span class="pln"> ind </span><span class="pun">==</span><span class="str">'剪刀'</span><span class="pun">)</span><span class="pln"> </span><span class="kwd">or</span><span class="pln"> </span><span class="pun">(</span><span class="pln">m </span><span class="pun">==</span><span class="pln"> </span><span class="str">'剪刀'</span><span class="pln"> </span><span class="kwd">and</span><span class="pln"> ind </span><span class="pun">==</span><span class="str">'布'</span><span class="pun">)</span><span class="pln"> </span><span class="kwd">or</span><span class="pln"> </span><span class="pun">(</span><span class="pln">m </span><span class="pun">==</span><span class="pln"> </span><span class="str">'布'</span><span class="pln"> </span><span class="kwd">and</span><span class="pln"> ind </span><span class="pun">==</span><span class="str">'石头'</span><span class="pun">):</span><span class="pln">
        </span><span class="kwd">print</span><span class="pln"> </span><span class="pun">(</span><span class="str">"电脑出了： "</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> ind </span><span class="pun">+</span><span class="str">"，你赢了！"</span><span class="pun">)</span><span class="pln">
    </span><span class="kwd">else</span><span class="pun">:</span><span class="pln">
        </span><span class="kwd">print</span><span class="pln"> </span><span class="pun">(</span><span class="str">"电脑出了： "</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> ind </span><span class="pun">+</span><span class="str">"，你输了！"</span><span class="pun">)</span><button class="copy-code-button" type="button" data-clipboard-text="import random
while 1:
    s=int(random.randint(1,3))
    if s==1:
        ind=&quot;石头&quot;
    elif s==2:
        ind=&quot;剪刀&quot;
    elif s==3:
        ind=&quot;布&quot; 
    m=input(&#39;输入石头，剪刀，布，输入end结束游戏：&#39;)
    
    blist=[&#39;石头&#39;,&#39;剪刀&#39;,&#39;布&#39;]
    
    if(m not in blist) and (m!=&#39;end&#39;):
        print(&quot;输入错误，重试：&quot;)
    elif(m==&#39;end&#39;)and(m not in blist):
        print(ind)
        print(&quot;\n游戏退出&quot;)
        break
    elif m==ind:
        print(&quot;平&quot;)
    elif (m == &#39;石头&#39; and ind ==&#39;剪刀&#39;) or (m == &#39;剪刀&#39; and ind ==&#39;布&#39;) or (m == &#39;布&#39; and ind ==&#39;石头&#39;):
        print (&quot;电脑出了： &quot; + ind +&quot;，你赢了！&quot;)
    else:
        print (&quot;电脑出了： &quot; + ind +&quot;，你输了！&quot;)"></button></pre><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">jason</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;jason</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;598***652@qq.com</p></div></span>6年前 (2018-07-16)</div></div></li><!-- #comment-## -->
<li class="comment even thread-even depth-1" id="comment-29975"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;sprinkle</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;117***1554@qq.com</p></div><div id="runoobvote-id-29975" data-commid="29975" class="upvotejs upvotejs-enabled"><a class="upvote"></a> <span class="count">28</span></div></div><div class="comt-main" id="div-comment-29975"><p>原九九乘法表逆时针输出：</p><pre class="prettyprint prettyprinted" style=""><span class="pln">
</span><span class="tag">&lt;pre&gt;</span><span class="pln">for i in range(9,0,-1):
    for j in range (1,i):
        print("\t",end="")
    for k in range (i,10):
        print("%dx%d=%d" % (i,k,k*i), end="\t")
    print()</span><button class="copy-code-button" type="button" data-clipboard-text="
&lt;pre&gt;for i in range(9,0,-1):
    for j in range (1,i):
        print(&quot;\t&quot;,end=&quot;&quot;)
    for k in range (i,10):
        print(&quot;%dx%d=%d&quot; % (i,k,k*i), end=&quot;\t&quot;)
    print()"></button></pre>
<div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">sprinkle</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;sprinkle</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;117***1554@qq.com</p></div></span>6年前 (2018-07-21)</div></div></li><!-- #comment-## -->
<li class="comment odd alt thread-odd thread-alt depth-1" id="comment-29976"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;sprinkle</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;117***1554@qq.com</p></div><div id="runoobvote-id-29976" data-commid="29976" class="upvotejs upvotejs-enabled"><a class="upvote"></a> <span class="count">35</span></div></div><div class="comt-main" id="div-comment-29976"><p><strong>彩票游戏</strong></p>

<pre class="prettyprint prettyprinted" style=""><span class="kwd">import</span><span class="pln"> random

t1</span><span class="pun">=</span><span class="str">"开始游戏"</span><span class="pln">
t2</span><span class="pun">=</span><span class="str">"结束游戏"</span><span class="pln">
</span><span class="kwd">print</span><span class="pun">(</span><span class="pln">t1</span><span class="pun">.</span><span class="pln">center</span><span class="pun">(</span><span class="lit">50</span><span class="pun">,</span><span class="str">"*"</span><span class="pun">))</span><span class="pln">
data1</span><span class="pun">=[]</span><span class="pln">
money</span><span class="pun">=</span><span class="kwd">int</span><span class="pun">(</span><span class="pln">input</span><span class="pun">(</span><span class="str">"输入投入的金额："</span><span class="pun">))</span><span class="pln">
</span><span class="kwd">print</span><span class="pun">(</span><span class="str">"你现在余额为：%d元"</span><span class="pun">%</span><span class="pln">money</span><span class="pun">)</span><span class="pln">
</span><span class="kwd">while</span><span class="pln"> </span><span class="lit">1</span><span class="pun">:</span><span class="pln">
    </span><span class="kwd">for</span><span class="pln"> i </span><span class="kwd">in</span><span class="pln"> range</span><span class="pun">(</span><span class="lit">6</span><span class="pun">):</span><span class="pln">
        n </span><span class="pun">=</span><span class="pln"> random</span><span class="pun">.</span><span class="pln">choice</span><span class="pun">([</span><span class="lit">0</span><span class="pun">,</span><span class="pln"> </span><span class="lit">1</span><span class="pun">])</span><span class="pln">
        data1</span><span class="pun">.</span><span class="pln">append</span><span class="pun">(</span><span class="pln">n</span><span class="pun">)</span><span class="pln">
    </span><span class="kwd">if</span><span class="pln"> money</span><span class="pun">&lt;</span><span class="lit">2</span><span class="pun">:</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">(</span><span class="str">"你的余额不足，请充值"</span><span class="pun">)</span><span class="pln">
        m</span><span class="pun">=</span><span class="pln">input</span><span class="pun">(</span><span class="str">"输入投入的金额："</span><span class="pun">)</span><span class="pln">
        </span><span class="kwd">if</span><span class="pln"> </span><span class="kwd">int</span><span class="pun">(</span><span class="pln">m</span><span class="pun">)==</span><span class="lit">0</span><span class="pun">:</span><span class="pln">
            </span><span class="kwd">break</span><span class="pln">
        </span><span class="kwd">else</span><span class="pun">:</span><span class="pln">
            money</span><span class="pun">=</span><span class="kwd">int</span><span class="pun">(</span><span class="pln">m</span><span class="pun">)</span><span class="pln">
    </span><span class="kwd">while</span><span class="pln"> </span><span class="lit">1</span><span class="pun">:</span><span class="pln">
        j</span><span class="pun">=</span><span class="kwd">int</span><span class="pun">(</span><span class="pln">input</span><span class="pun">(</span><span class="str">"输入购买彩票数量"</span><span class="pun">))</span><span class="pln">
        </span><span class="kwd">if</span><span class="pln"> money</span><span class="pun">-</span><span class="pln">j</span><span class="pun">*</span><span class="lit">2</span><span class="pun">&lt;</span><span class="lit">0</span><span class="pun">:</span><span class="pln">
            </span><span class="kwd">print</span><span class="pun">(</span><span class="str">"购买后余额不足，请重新输入"</span><span class="pun">)</span><span class="pln">
        </span><span class="kwd">else</span><span class="pun">:</span><span class="pln">
            money </span><span class="pun">=</span><span class="pln"> money </span><span class="pun">-</span><span class="pln"> j </span><span class="pun">*</span><span class="pln"> </span><span class="lit">2</span><span class="pln">
            </span><span class="kwd">print</span><span class="pun">(</span><span class="str">"你现在余额为：%d元"</span><span class="pln"> </span><span class="pun">%</span><span class="pln"> money</span><span class="pun">)</span><span class="pln">
            </span><span class="kwd">break</span><span class="pln">
    </span><span class="kwd">print</span><span class="pun">(</span><span class="str">"提示：中奖数据有六位数，每位数为0或者1"</span><span class="pun">)</span><span class="pln">
    n2</span><span class="pun">=</span><span class="pln">input</span><span class="pun">(</span><span class="str">"请猜测中奖数据：（输入的数字为0或1）"</span><span class="pun">)</span><span class="pln">
    </span><span class="kwd">print</span><span class="pun">(</span><span class="pln">str</span><span class="pun">(</span><span class="pln">data1</span><span class="pun">))</span><span class="pln">
    f</span><span class="pun">=[]</span><span class="pln">
    </span><span class="kwd">for</span><span class="pln"> x </span><span class="kwd">in</span><span class="pln"> n2</span><span class="pun">:</span><span class="pln">
        f</span><span class="pun">.</span><span class="pln">append</span><span class="pun">(</span><span class="pln">x</span><span class="pun">)</span><span class="pln">
    f1 </span><span class="pun">=</span><span class="pln"> str</span><span class="pun">(</span><span class="pln">f</span><span class="pun">)</span><span class="pln">
    f2 </span><span class="pun">=</span><span class="pln"> f1</span><span class="pun">.</span><span class="pln">split</span><span class="pun">(</span><span class="str">"'"</span><span class="pun">)</span><span class="pln">
    f3 </span><span class="pun">=</span><span class="pln"> </span><span class="str">""</span><span class="pun">.</span><span class="pln">join</span><span class="pun">(</span><span class="pln">f2</span><span class="pun">)</span><span class="pln">
    </span><span class="kwd">print</span><span class="pun">(</span><span class="str">"你猜测的数据为："</span><span class="pun">,</span><span class="pln"> f3</span><span class="pun">)</span><span class="pln">
    </span><span class="kwd">if</span><span class="pln"> f3</span><span class="pun">==</span><span class="pln">str</span><span class="pun">(</span><span class="pln">data1</span><span class="pun">):</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">(</span><span class="str">"中奖数字为："</span><span class="pun">,</span><span class="pln">data1</span><span class="pun">)</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">(</span><span class="str">"恭喜你中大奖啦"</span><span class="pun">)</span><span class="pln">
        money</span><span class="pun">=</span><span class="pln">money</span><span class="pun">+</span><span class="pln">j</span><span class="pun">*</span><span class="lit">100</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">(</span><span class="str">"你现在余额为：%d元"</span><span class="pln"> </span><span class="pun">%</span><span class="pln"> money</span><span class="pun">)</span><span class="pln">
    </span><span class="kwd">else</span><span class="pun">:</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">(</span><span class="str">"中奖数字为："</span><span class="pun">,</span><span class="pln"> data1</span><span class="pun">)</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">(</span><span class="str">"没有中奖，请继续加油"</span><span class="pun">)</span><span class="pln">
    con </span><span class="pun">=</span><span class="pln"> input</span><span class="pun">(</span><span class="str">"请问还要继续么？结束请输入no,继续请任意输入字符："</span><span class="pun">)</span><span class="pln">
    </span><span class="kwd">if</span><span class="pln"> con</span><span class="pun">==</span><span class="str">"no"</span><span class="pun">:</span><span class="pln">
        </span><span class="kwd">break</span><span class="pln">
    data1</span><span class="pun">=[]</span><span class="pln">
</span><span class="kwd">print</span><span class="pun">(</span><span class="pln">t2</span><span class="pun">.</span><span class="pln">center</span><span class="pun">(</span><span class="lit">50</span><span class="pun">,</span><span class="str">"*"</span><span class="pun">))</span><span class="pln">
</span><span class="kwd">print</span><span class="pun">(</span><span class="str">"你的余额为：%d元"</span><span class="pun">%</span><span class="pln">money</span><span class="pun">)</span><button class="copy-code-button" type="button" data-clipboard-text="import random

t1=&quot;开始游戏&quot;
t2=&quot;结束游戏&quot;
print(t1.center(50,&quot;*&quot;))
data1=[]
money=int(input(&quot;输入投入的金额：&quot;))
print(&quot;你现在余额为：%d元&quot;%money)
while 1:
    for i in range(6):
        n = random.choice([0, 1])
        data1.append(n)
    if money&lt;2:
        print(&quot;你的余额不足，请充值&quot;)
        m=input(&quot;输入投入的金额：&quot;)
        if int(m)==0:
            break
        else:
            money=int(m)
    while 1:
        j=int(input(&quot;输入购买彩票数量&quot;))
        if money-j*2&lt;0:
            print(&quot;购买后余额不足，请重新输入&quot;)
        else:
            money = money - j * 2
            print(&quot;你现在余额为：%d元&quot; % money)
            break
    print(&quot;提示：中奖数据有六位数，每位数为0或者1&quot;)
    n2=input(&quot;请猜测中奖数据：（输入的数字为0或1）&quot;)
    print(str(data1))
    f=[]
    for x in n2:
        f.append(x)
    f1 = str(f)
    f2 = f1.split(&quot;&#39;&quot;)
    f3 = &quot;&quot;.join(f2)
    print(&quot;你猜测的数据为：&quot;, f3)
    if f3==str(data1):
        print(&quot;中奖数字为：&quot;,data1)
        print(&quot;恭喜你中大奖啦&quot;)
        money=money+j*100
        print(&quot;你现在余额为：%d元&quot; % money)
    else:
        print(&quot;中奖数字为：&quot;, data1)
        print(&quot;没有中奖，请继续加油&quot;)
    con = input(&quot;请问还要继续么？结束请输入no,继续请任意输入字符：&quot;)
    if con==&quot;no&quot;:
        break
    data1=[]
print(t2.center(50,&quot;*&quot;))
print(&quot;你的余额为：%d元&quot;%money)"></button></pre>
<div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">sprinkle</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;sprinkle</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;117***1554@qq.com</p></div></span>6年前 (2018-07-21)</div></div></li><!-- #comment-## -->
<li class="comment even thread-even depth-1" id="comment-35157"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;dzr</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;lei***407631@qq.com</p></div><div id="runoobvote-id-35157" data-commid="35157" class="upvotejs upvotejs-enabled"><a class="upvote"></a> <span class="count">22</span></div></div><div class="comt-main" id="div-comment-35157"><p><strong>生成直观的九连环解法：</strong></p>

<pre class="prettyprint prettyprinted" style=""><span class="com">#!/usr/bin/python</span><span class="pln">
x </span><span class="pun">=</span><span class="pln"> </span><span class="pun">[</span><span class="str">"-θ"</span><span class="pun">,</span><span class="str">"-θ"</span><span class="pun">,</span><span class="str">"-θ"</span><span class="pun">,</span><span class="str">"-θ"</span><span class="pun">,</span><span class="str">"-θ"</span><span class="pun">,</span><span class="str">"-θ"</span><span class="pun">,</span><span class="str">"-θ"</span><span class="pun">,</span><span class="str">"-θ"</span><span class="pun">,</span><span class="str">"-θ"</span><span class="pun">]</span><span class="pln">
y </span><span class="pun">=</span><span class="pln"> </span><span class="pun">[</span><span class="str">"—"</span><span class="pun">,</span><span class="str">"—"</span><span class="pun">,</span><span class="str">"—"</span><span class="pun">,</span><span class="str">"—"</span><span class="pun">,</span><span class="str">"—"</span><span class="pun">,</span><span class="str">"—"</span><span class="pun">,</span><span class="str">"—"</span><span class="pun">,</span><span class="str">"—"</span><span class="pun">,</span><span class="str">"—"</span><span class="pun">]</span><span class="pln">
</span><span class="kwd">def</span><span class="pln"> down</span><span class="pun">(</span><span class="pln">n</span><span class="pun">,</span><span class="pln"> l</span><span class="pun">):</span><span class="pln"> </span><span class="com">#拆解</span><span class="pln">
    v </span><span class="pun">=</span><span class="pln"> len</span><span class="pun">(</span><span class="pln">l</span><span class="pun">)</span><span class="pln"> </span><span class="com">#计算数列个数用于改变数列对应位置</span><span class="pln">
    </span><span class="kwd">if</span><span class="pln"> n</span><span class="pun">&gt;</span><span class="lit">2</span><span class="pun">:</span><span class="pln">
        down</span><span class="pun">(</span><span class="pln">n</span><span class="pun">-</span><span class="lit">2</span><span class="pun">,</span><span class="pln"> l</span><span class="pun">)</span><span class="pln"> </span><span class="com">#拆下n-2的环</span><span class="pln">
        l</span><span class="pun">[</span><span class="pln">v</span><span class="pun">-</span><span class="pln">n</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="str">"—"</span><span class="pln"> </span><span class="com">#将v-n位"-θ"改为"—" 表示拆下</span><span class="pln">
        </span><span class="kwd">for</span><span class="pln"> x </span><span class="kwd">in</span><span class="pln"> l</span><span class="pun">:</span><span class="pln">  </span><span class="com">#输出列表每一个元素</span><span class="pln">
            </span><span class="kwd">print</span><span class="pun">(</span><span class="pln">x</span><span class="pun">,</span><span class="kwd">end</span><span class="pun">=</span><span class="str">' '</span><span class="pun">)</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">()</span><span class="pln"> </span><span class="com">#换行</span><span class="pln">
        up</span><span class="pun">(</span><span class="pln">n</span><span class="pun">-</span><span class="lit">2</span><span class="pun">,</span><span class="pln"> l</span><span class="pun">)</span><span class="pln"> </span><span class="com">#装上n-2位</span><span class="pln">
        down</span><span class="pun">(</span><span class="pln">n</span><span class="pun">-</span><span class="lit">1</span><span class="pun">,</span><span class="pln"> l</span><span class="pun">)#拆下</span><span class="pln">n</span><span class="pun">-</span><span class="lit">1</span><span class="pun">位，</span><span class="pln"> </span><span class="pun">后面同理</span><span class="pln">
    </span><span class="kwd">if</span><span class="pln"> n</span><span class="pun">==</span><span class="lit">2</span><span class="pun">:</span><span class="pln">
        l</span><span class="pun">[</span><span class="pln">v</span><span class="pun">-</span><span class="lit">2</span><span class="pun">],</span><span class="pln"> l</span><span class="pun">[</span><span class="pln">v</span><span class="pun">-</span><span class="lit">1</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=</span><span class="str">"—"</span><span class="pun">,</span><span class="str">"—"</span><span class="pln">
        </span><span class="kwd">for</span><span class="pln"> x </span><span class="kwd">in</span><span class="pln"> l</span><span class="pun">:</span><span class="pln">
            </span><span class="kwd">print</span><span class="pun">(</span><span class="pln">x</span><span class="pun">,</span><span class="kwd">end</span><span class="pun">=</span><span class="str">' '</span><span class="pun">)</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">()</span><span class="pln">
    </span><span class="kwd">if</span><span class="pln"> n</span><span class="pun">&lt;</span><span class="lit">2</span><span class="pun">:</span><span class="pln">
        l</span><span class="pun">[</span><span class="pln">v</span><span class="pun">-</span><span class="lit">1</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="str">"—"</span><span class="pln">
        </span><span class="kwd">for</span><span class="pln"> x </span><span class="kwd">in</span><span class="pln"> l</span><span class="pun">:</span><span class="pln">
            </span><span class="kwd">print</span><span class="pun">(</span><span class="pln">x</span><span class="pun">,</span><span class="kwd">end</span><span class="pun">=</span><span class="str">' '</span><span class="pun">)</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">()</span><span class="pln">
</span><span class="kwd">def</span><span class="pln"> up</span><span class="pun">(</span><span class="pln">n</span><span class="pun">,</span><span class="pln"> l</span><span class="pun">):</span><span class="pln">
    v </span><span class="pun">=</span><span class="pln"> len</span><span class="pun">(</span><span class="pln">l</span><span class="pun">)</span><span class="pln">
    </span><span class="kwd">if</span><span class="pln"> n</span><span class="pun">&gt;</span><span class="lit">2</span><span class="pun">:</span><span class="pln">
        up</span><span class="pun">(</span><span class="pln">n</span><span class="pun">-</span><span class="lit">1</span><span class="pun">,</span><span class="pln"> l</span><span class="pun">)</span><span class="pln">
        down</span><span class="pun">(</span><span class="pln">n</span><span class="pun">-</span><span class="lit">2</span><span class="pun">,</span><span class="pln"> l</span><span class="pun">)</span><span class="pln">
        l</span><span class="pun">[</span><span class="pln">v</span><span class="pun">-</span><span class="pln">n</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="str">"-θ"</span><span class="pln">
        </span><span class="kwd">for</span><span class="pln"> x </span><span class="kwd">in</span><span class="pln"> l</span><span class="pun">:</span><span class="pln">
            </span><span class="kwd">print</span><span class="pun">(</span><span class="pln">x</span><span class="pun">,</span><span class="kwd">end</span><span class="pun">=</span><span class="str">' '</span><span class="pun">)</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">()</span><span class="pln">
        up</span><span class="pun">(</span><span class="pln">n</span><span class="pun">-</span><span class="lit">2</span><span class="pun">,</span><span class="pln"> l</span><span class="pun">)</span><span class="pln">
    </span><span class="kwd">if</span><span class="pln"> n</span><span class="pun">==</span><span class="lit">2</span><span class="pun">:</span><span class="pln">
        l</span><span class="pun">[</span><span class="pln">v</span><span class="pun">-</span><span class="lit">2</span><span class="pun">],</span><span class="pln"> l</span><span class="pun">[</span><span class="pln">v</span><span class="pun">-</span><span class="lit">1</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="str">"-θ"</span><span class="pun">,</span><span class="str">"-θ"</span><span class="pln">
        </span><span class="kwd">for</span><span class="pln"> x </span><span class="kwd">in</span><span class="pln"> l</span><span class="pun">:</span><span class="pln">
            </span><span class="kwd">print</span><span class="pun">(</span><span class="pln">x</span><span class="pun">,</span><span class="kwd">end</span><span class="pun">=</span><span class="str">' '</span><span class="pun">)</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">()</span><span class="pln">
    </span><span class="kwd">if</span><span class="pln"> n</span><span class="pun">&lt;</span><span class="lit">2</span><span class="pun">:</span><span class="pln">
        l</span><span class="pun">[</span><span class="pln">v</span><span class="pun">-</span><span class="lit">1</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=</span><span class="str">"-θ"</span><span class="pln">
        </span><span class="kwd">for</span><span class="pln"> x </span><span class="kwd">in</span><span class="pln"> l</span><span class="pun">:</span><span class="pln">
            </span><span class="kwd">print</span><span class="pun">(</span><span class="pln">x</span><span class="pun">,</span><span class="kwd">end</span><span class="pun">=</span><span class="str">' '</span><span class="pun">)</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">()</span><span class="pln">

</span><span class="kwd">print</span><span class="pun">(</span><span class="str">"拆解\n"</span><span class="pun">)</span><span class="pln">
</span><span class="kwd">for</span><span class="pln"> i </span><span class="kwd">in</span><span class="pln"> x</span><span class="pun">:</span><span class="pln">
    </span><span class="kwd">print</span><span class="pun">(</span><span class="pln">i</span><span class="pun">,</span><span class="kwd">end</span><span class="pun">=</span><span class="str">' '</span><span class="pun">)</span><span class="pln">
</span><span class="kwd">print</span><span class="pun">()</span><span class="pln">
down</span><span class="pun">(</span><span class="lit">9</span><span class="pun">,</span><span class="pln"> x</span><span class="pun">)</span><span class="pln">
</span><span class="kwd">print</span><span class="pun">(</span><span class="str">'---------------------------------\n'</span><span class="pun">,</span><span class="str">'装上\n'</span><span class="pun">)</span><span class="pln">
</span><span class="kwd">for</span><span class="pln"> i </span><span class="kwd">in</span><span class="pln"> y</span><span class="pun">:</span><span class="pln">
    </span><span class="kwd">print</span><span class="pun">(</span><span class="pln">i</span><span class="pun">,</span><span class="kwd">end</span><span class="pun">=</span><span class="str">' '</span><span class="pun">)</span><span class="pln">
</span><span class="kwd">print</span><span class="pun">()</span><span class="pln">
up</span><span class="pun">(</span><span class="lit">9</span><span class="pun">,</span><span class="pln"> y</span><span class="pun">)</span><span class="pln">
</span><span class="kwd">print</span><span class="pun">(</span><span class="str">"结束"</span><span class="pun">)</span><button class="copy-code-button" type="button" data-clipboard-text="#!/usr/bin/python
x = [&quot;-θ&quot;,&quot;-θ&quot;,&quot;-θ&quot;,&quot;-θ&quot;,&quot;-θ&quot;,&quot;-θ&quot;,&quot;-θ&quot;,&quot;-θ&quot;,&quot;-θ&quot;]
y = [&quot;—&quot;,&quot;—&quot;,&quot;—&quot;,&quot;—&quot;,&quot;—&quot;,&quot;—&quot;,&quot;—&quot;,&quot;—&quot;,&quot;—&quot;]
def down(n, l): #拆解
    v = len(l) #计算数列个数用于改变数列对应位置
    if n&gt;2:
        down(n-2, l) #拆下n-2的环
        l[v-n] = &quot;—&quot; #将v-n位&quot;-θ&quot;改为&quot;—&quot; 表示拆下
        for x in l:  #输出列表每一个元素
            print(x,end=&#39; &#39;)
        print() #换行
        up(n-2, l) #装上n-2位
        down(n-1, l)#拆下n-1位， 后面同理
    if n==2:
        l[v-2], l[v-1] =&quot;—&quot;,&quot;—&quot;
        for x in l:
            print(x,end=&#39; &#39;)
        print()
    if n&lt;2:
        l[v-1] = &quot;—&quot;
        for x in l:
            print(x,end=&#39; &#39;)
        print()
def up(n, l):
    v = len(l)
    if n&gt;2:
        up(n-1, l)
        down(n-2, l)
        l[v-n] = &quot;-θ&quot;
        for x in l:
            print(x,end=&#39; &#39;)
        print()
        up(n-2, l)
    if n==2:
        l[v-2], l[v-1] = &quot;-θ&quot;,&quot;-θ&quot;
        for x in l:
            print(x,end=&#39; &#39;)
        print()
    if n&lt;2:
        l[v-1] =&quot;-θ&quot;
        for x in l:
            print(x,end=&#39; &#39;)
        print()

print(&quot;拆解\n&quot;)
for i in x:
    print(i,end=&#39; &#39;)
print()
down(9, x)
print(&#39;---------------------------------\n&#39;,&#39;装上\n&#39;)
for i in y:
    print(i,end=&#39; &#39;)
print()
up(9, y)
print(&quot;结束&quot;)"></button></pre>


<p><strong>九连环拆解，递归算法</strong></p>

<pre class="prettyprint prettyprinted" style=""><span class="pln"> </span><span class="kwd">def</span><span class="pln"> down</span><span class="pun">(</span><span class="pln">n</span><span class="pun">):</span><span class="pln">
    </span><span class="kwd">if</span><span class="pln"> n</span><span class="pun">&gt;</span><span class="lit">2</span><span class="pun">:</span><span class="pln">
        down</span><span class="pun">(</span><span class="pln">n</span><span class="pun">-</span><span class="lit">2</span><span class="pun">)</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">(</span><span class="str">'卸下'</span><span class="pun">,</span><span class="pln">n</span><span class="pun">,</span><span class="str">'环'</span><span class="pun">)</span><span class="pln">
        up</span><span class="pun">(</span><span class="pln">n</span><span class="pun">-</span><span class="lit">2</span><span class="pun">)</span><span class="pln">
        down</span><span class="pun">(</span><span class="pln">n</span><span class="pun">-</span><span class="lit">1</span><span class="pun">)</span><span class="pln">
    </span><span class="kwd">if</span><span class="pln"> n</span><span class="pun">==</span><span class="lit">2</span><span class="pun">:</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">(</span><span class="str">'卸下 {},{} 环'</span><span class="pun">.</span><span class="pln">format</span><span class="pun">(</span><span class="pln">n</span><span class="pun">,</span><span class="pln">n</span><span class="pun">-</span><span class="lit">1</span><span class="pun">))</span><span class="pln">    
    </span><span class="kwd">if</span><span class="pln"> n</span><span class="pun">&lt;</span><span class="lit">2</span><span class="pun">:</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">(</span><span class="str">'卸下'</span><span class="pun">,</span><span class="pln">n</span><span class="pun">,</span><span class="str">'环'</span><span class="pun">)</span><span class="pln"> 
        
</span><span class="kwd">def</span><span class="pln"> up</span><span class="pun">(</span><span class="pln">n</span><span class="pun">):</span><span class="pln">
    </span><span class="kwd">if</span><span class="pln"> n</span><span class="pun">&gt;</span><span class="lit">2</span><span class="pun">:</span><span class="pln">
        up</span><span class="pun">(</span><span class="pln">n</span><span class="pun">-</span><span class="lit">1</span><span class="pun">)</span><span class="pln">
        down</span><span class="pun">(</span><span class="pln">n</span><span class="pun">-</span><span class="lit">2</span><span class="pun">)</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">(</span><span class="str">"装上"</span><span class="pun">,</span><span class="pln">n</span><span class="pun">,</span><span class="str">"环"</span><span class="pun">)</span><span class="pln">
        up</span><span class="pun">(</span><span class="pln">n</span><span class="pun">-</span><span class="lit">2</span><span class="pun">)</span><span class="pln">
    </span><span class="kwd">if</span><span class="pln"> n</span><span class="pun">==</span><span class="lit">2</span><span class="pun">:</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">(</span><span class="str">"装上 %d,%d 环"</span><span class="pln"> </span><span class="pun">%</span><span class="pln"> </span><span class="pun">(</span><span class="pln">n</span><span class="pun">,</span><span class="pln">n</span><span class="pun">-</span><span class="lit">1</span><span class="pun">))</span><span class="pln">
        
    </span><span class="kwd">if</span><span class="pln"> n</span><span class="pun">&lt;</span><span class="lit">2</span><span class="pun">:</span><span class="pln">
        </span><span class="kwd">print</span><span class="pun">(</span><span class="str">"装上"</span><span class="pun">,</span><span class="pln">n</span><span class="pun">,</span><span class="str">"环"</span><span class="pun">)</span><span class="pln">
</span><span class="kwd">print</span><span class="pun">(</span><span class="str">"拆解"</span><span class="pun">)</span><span class="pln">
down</span><span class="pun">(</span><span class="lit">2</span><span class="pun">)</span><span class="pln">
</span><span class="kwd">print</span><span class="pun">(</span><span class="str">'---------------------------------\n'</span><span class="pun">,</span><span class="str">'装上'</span><span class="pun">)</span><span class="pln">
up</span><span class="pun">(</span><span class="lit">3</span><span class="pun">)</span><span class="pln">
</span><span class="kwd">print</span><span class="pun">(</span><span class="str">"结束"</span><span class="pun">)</span><button class="copy-code-button" type="button" data-clipboard-text=" def down(n):
    if n&gt;2:
        down(n-2)
        print(&#39;卸下&#39;,n,&#39;环&#39;)
        up(n-2)
        down(n-1)
    if n==2:
        print(&#39;卸下 {},{} 环&#39;.format(n,n-1))    
    if n&lt;2:
        print(&#39;卸下&#39;,n,&#39;环&#39;) 
        
def up(n):
    if n&gt;2:
        up(n-1)
        down(n-2)
        print(&quot;装上&quot;,n,&quot;环&quot;)
        up(n-2)
    if n==2:
        print(&quot;装上 %d,%d 环&quot; % (n,n-1))
        
    if n&lt;2:
        print(&quot;装上&quot;,n,&quot;环&quot;)
print(&quot;拆解&quot;)
down(2)
print(&#39;---------------------------------\n&#39;,&#39;装上&#39;)
up(3)
print(&quot;结束&quot;)"></button></pre><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">dzr</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;dzr</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;lei***407631@qq.com</p></div></span>6年前 (2018-09-17)</div></div></li><!-- #comment-## -->
<li class="comment odd alt thread-odd thread-alt depth-1" id="comment-37338"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;Yota Togashi</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;116***47@qq.com</p></div><div id="runoobvote-id-37338" data-commid="37338" class="upvotejs upvotejs-enabled"><a class="upvote"></a> <span class="count">18</span></div></div><div class="comt-main" id="div-comment-37338"><p data-title="Python 选择排序">选择排序python版：</p>

<pre class="prettyprint prettyprinted" style=""><span class="pln">a</span><span class="pun">=[</span><span class="lit">1</span><span class="pun">,</span><span class="lit">5</span><span class="pun">,</span><span class="lit">4</span><span class="pun">,</span><span class="lit">2</span><span class="pun">,</span><span class="lit">2</span><span class="pun">,</span><span class="lit">21</span><span class="pun">,</span><span class="lit">12</span><span class="pun">,</span><span class="lit">7</span><span class="pun">,</span><span class="lit">0</span><span class="pun">]</span><span class="pln">
b</span><span class="pun">=</span><span class="pln">list</span><span class="pun">(</span><span class="kwd">set</span><span class="pun">(</span><span class="pln">a</span><span class="pun">))</span><span class="pln">  </span><span class="com"># 建立新的列表，嵌套的是集合（除去冗余元素并自动排序）</span><span class="pln">
c</span><span class="pun">=[]</span><span class="pln">  </span><span class="com"># 建立空列表，用来存放选择排序的数据</span><span class="pln">
</span><span class="kwd">for</span><span class="pln"> j </span><span class="kwd">in</span><span class="pln"> b</span><span class="pun">:</span><span class="pln"> </span><span class="com">#集合列表中选择元素</span><span class="pln">
    </span><span class="kwd">for</span><span class="pln"> i </span><span class="kwd">in</span><span class="pln"> a</span><span class="pun">:</span><span class="pln"> </span><span class="com">#列表中选择元素，</span><span class="pln">
        </span><span class="kwd">if</span><span class="pln"> i </span><span class="pun">==</span><span class="pln">j</span><span class="pun">:</span><span class="pln">
            c</span><span class="pun">.</span><span class="pln">append</span><span class="pun">(</span><span class="pln">i</span><span class="pun">)</span><span class="pln">

</span><span class="kwd">print</span><span class="pun">(</span><span class="pln">c</span><span class="pun">)</span><span class="pln">

</span><span class="str">'''
我输入的列表元素集合有：1，2，4，5，12，21（已排好序并除去冗余）
其中我依次选择集合中的各个数据，与原来列表的元素相比
如果相等，我就把a集合的相对应的数据存到空列表里
'''</span><button class="copy-code-button" type="button" data-clipboard-text="a=[1,5,4,2,2,21,12,7,0]
b=list(set(a))  # 建立新的列表，嵌套的是集合（除去冗余元素并自动排序）
c=[]  # 建立空列表，用来存放选择排序的数据
for j in b: #集合列表中选择元素
    for i in a: #列表中选择元素，
        if i ==j:
            c.append(i)

print(c)

&#39;&#39;&#39;
我输入的列表元素集合有：1，2，4，5，12，21（已排好序并除去冗余）
其中我依次选择集合中的各个数据，与原来列表的元素相比
如果相等，我就把a集合的相对应的数据存到空列表里
&#39;&#39;&#39;"></button></pre>
<p>当然，有一种更方便的排序方式：</p>

<pre class="prettyprint prettyprinted" style=""><span class="pln">a</span><span class="pun">=[</span><span class="lit">1</span><span class="pun">,</span><span class="lit">2</span><span class="pun">,</span><span class="lit">5</span><span class="pun">,</span><span class="lit">8</span><span class="pun">,</span><span class="lit">3</span><span class="pun">,</span><span class="lit">6</span><span class="pun">,</span><span class="lit">6</span><span class="pun">,</span><span class="lit">6</span><span class="pun">,</span><span class="lit">6</span><span class="pun">,</span><span class="lit">6</span><span class="pun">]</span><span class="pln">
a</span><span class="pun">.</span><span class="pln">sort</span><span class="pun">()</span><span class="pln">
</span><span class="kwd">print</span><span class="pun">(</span><span class="pln">a</span><span class="pun">)</span><button class="copy-code-button" type="button" data-clipboard-text="a=[1,2,5,8,3,6,6,6,6,6]
a.sort()
print(a)"></button></pre>
<div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="https://www.runoob.com/note/37338">Yota Togashi</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;Yota Togashi</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;116***47@qq.com</p></div></span>6年前 (2018-11-23)</div></div></li><!-- #comment-## -->
<li class="comment even thread-even depth-1" id="comment-40033"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;哈哈哈</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;146***5306@qq.com</p></div><div id="runoobvote-id-40033" data-commid="40033" class="upvotejs upvotejs-enabled"><a class="upvote"></a> <span class="count">21</span></div></div><div class="comt-main" id="div-comment-40033"><p>一个四位数 abcd，满足 abcd&nbsp;*&nbsp;4&nbsp;=&nbsp;dcba，求这个数:</p>
<pre class="prettyprint prettyprinted" style=""><span class="kwd">for</span><span class="pln"> i </span><span class="kwd">in</span><span class="pln"> list</span><span class="pun">(</span><span class="pln">range</span><span class="pun">(</span><span class="lit">1000</span><span class="pun">,</span><span class="lit">2500</span><span class="pun">)):</span><span class="pln">
    num2 </span><span class="pun">=</span><span class="pln"> i</span><span class="pun">*</span><span class="lit">4</span><span class="pln">
    a </span><span class="pun">=</span><span class="pln"> i </span><span class="com">//1000</span><span class="pln">
    b </span><span class="pun">=</span><span class="pln"> i </span><span class="pun">%</span><span class="pln"> </span><span class="lit">1000</span><span class="com">//100</span><span class="pln">
    c </span><span class="pun">=</span><span class="pln"> i </span><span class="pun">%</span><span class="pln"> </span><span class="lit">1000</span><span class="pun">%</span><span class="lit">100</span><span class="com">//10 </span><span class="pln">
    d </span><span class="pun">=</span><span class="pln"> i </span><span class="pun">%</span><span class="pln"> </span><span class="lit">10</span><span class="pln"> 
    e </span><span class="pun">=</span><span class="pln"> num2 </span><span class="com">//1000</span><span class="pln">
    f </span><span class="pun">=</span><span class="pln"> num2 </span><span class="pun">%</span><span class="pln"> </span><span class="lit">1000</span><span class="com">//100</span><span class="pln">
    g </span><span class="pun">=</span><span class="pln"> num2 </span><span class="pun">%</span><span class="pln"> </span><span class="lit">1000</span><span class="pun">%</span><span class="lit">100</span><span class="com">//10 </span><span class="pln">
    h </span><span class="pun">=</span><span class="pln"> num2 </span><span class="pun">%</span><span class="pln"> </span><span class="lit">10</span><span class="pln"> 

    </span><span class="kwd">if</span><span class="pln"> a</span><span class="pun">==</span><span class="pln">h</span><span class="pun">:</span><span class="pln">
        </span><span class="kwd">if</span><span class="pln"> b</span><span class="pun">==</span><span class="pln">g</span><span class="pun">:</span><span class="pln">
            </span><span class="kwd">if</span><span class="pln"> c</span><span class="pun">==</span><span class="pln"> f</span><span class="pun">:</span><span class="pln">
                </span><span class="kwd">if</span><span class="pln"> d</span><span class="pun">==</span><span class="pln">e</span><span class="pun">:</span><span class="pln">
                    </span><span class="kwd">print</span><span class="pun">(</span><span class="pln">num2</span><span class="pun">,</span><span class="kwd">end</span><span class="pun">=</span><span class="str">','</span><span class="pun">)</span><button class="copy-code-button" type="button" data-clipboard-text="for i in list(range(1000,2500)):
    num2 = i*4
    a = i //1000
    b = i % 1000//100
    c = i % 1000%100//10 
    d = i % 10 
    e = num2 //1000
    f = num2 % 1000//100
    g = num2 % 1000%100//10 
    h = num2 % 10 

    if a==h:
        if b==g:
            if c== f:
                if d==e:
                    print(num2,end=&#39;,&#39;)"></button></pre>
<div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">哈哈哈</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;哈哈哈</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;146***5306@qq.com</p></div></span>5年前 (2019-02-22)</div></div></li><!-- #comment-## -->
<li class="comment odd alt thread-odd thread-alt depth-1" id="comment-60661"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;大宝v947</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;shg***er@163.com</p></div><div id="runoobvote-id-60661" data-commid="60661" class="upvotejs upvotejs-enabled"><a class="upvote"></a> <span class="count">40</span></div></div><div class="comt-main" id="div-comment-60661"><p>楼上的&nbsp; “一个四位数 abcd，满足 abcd&nbsp;*&nbsp;4&nbsp;=&nbsp;dcba，求这个数:”</p><p>有另一种处理方式，供参考</p><pre class="prettyprint prettyprinted" style=""><span class="kwd">for</span><span class="pln"> i </span><span class="kwd">in</span><span class="pln"> range</span><span class="pun">(</span><span class="lit">1000</span><span class="pun">,</span><span class="lit">9999</span><span class="pun">):</span><span class="pln">
        a </span><span class="pun">=</span><span class="pln"> i</span><span class="com">//1000</span><span class="pln">
        b </span><span class="pun">=</span><span class="pln"> i</span><span class="pun">%</span><span class="lit">1000</span><span class="com">//100</span><span class="pln">
        c </span><span class="pun">=</span><span class="pln"> i</span><span class="pun">%</span><span class="lit">1000</span><span class="pun">%</span><span class="lit">100</span><span class="com">//10</span><span class="pln">
        d </span><span class="pun">=</span><span class="pln"> i</span><span class="pun">%</span><span class="lit">1000</span><span class="pun">%</span><span class="lit">100</span><span class="pun">%</span><span class="lit">10</span><span class="pln">
        </span><span class="kwd">if</span><span class="pln"> i</span><span class="pun">*</span><span class="lit">4</span><span class="pln"> </span><span class="pun">==</span><span class="pln"> d</span><span class="pun">*</span><span class="lit">1000</span><span class="pun">+</span><span class="pln">c</span><span class="pun">*</span><span class="lit">100</span><span class="pun">+</span><span class="pln">b</span><span class="pun">*</span><span class="lit">10</span><span class="pun">+</span><span class="pln">a</span><span class="pun">:</span><span class="pln">
                </span><span class="kwd">print</span><span class="pun">(</span><span class="pln">i</span><span class="pun">,</span><span class="pln">i</span><span class="pun">,</span><span class="str">'*'</span><span class="pun">,</span><span class="lit">4</span><span class="pun">,</span><span class="str">'='</span><span class="pun">,</span><span class="pln">d</span><span class="pun">*</span><span class="lit">1000</span><span class="pun">+</span><span class="pln">c</span><span class="pun">*</span><span class="lit">100</span><span class="pun">+</span><span class="pln">b</span><span class="pun">*</span><span class="lit">10</span><span class="pun">+</span><span class="pln">a</span><span class="pun">)</span><button class="copy-code-button" type="button" data-clipboard-text="for i in range(1000,9999):
        a = i//1000
        b = i%1000//100
        c = i%1000%100//10
        d = i%1000%100%10
        if i*4 == d*1000+c*100+b*10+a:
                print(i,i,&#39;*&#39;,4,&#39;=&#39;,d*1000+c*100+b*10+a)
"></button></pre><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">大宝v947</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;大宝v947</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;shg***er@163.com</p></div></span>3年前 (2021-01-13)</div></div></li><!-- #comment-## -->
<li class="comment even thread-even depth-1" id="comment-71805"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;Cai0029</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;cai***9@sohu.com</p></div><div id="runoobvote-id-71805" data-commid="71805" class="upvotejs upvotejs-enabled"><a class="upvote"></a> <span class="count">21</span></div></div><div class="comt-main" id="div-comment-71805"><p><strong>冒泡排序，python 版本-20220411</strong></p>

<p>解析：很经典的排序方式，从数组中的第0个元素开始，与后面一个元素进行比较，如果前面的元素大于后面的元素，就调换位置，循环到最后（即：a0与a1比较得到结果后，a1与a2比较...），最大的元素被换到数组最末尾，剔除掉最后一个元素，在余下的数组元素中进行上述操作，到最后，整个数组呈现从小到大的排序</p>

<pre class="prettyprint prettyprinted" style=""><span class="com"># python 冒泡排序</span><span class="pln">
</span><span class="kwd">def</span><span class="pln"> paixu</span><span class="pun">(</span><span class="pln">li</span><span class="pun">)</span><span class="pln"> </span><span class="pun">:</span><span class="pln">
    mx </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pln">
    </span><span class="kwd">for</span><span class="pln"> ad </span><span class="kwd">in</span><span class="pln"> range</span><span class="pun">(</span><span class="pln">len</span><span class="pun">(</span><span class="pln">li</span><span class="pun">)</span><span class="pln"> </span><span class="pun">-</span><span class="pln"> </span><span class="lit">1</span><span class="pun">):</span><span class="pln">
        </span><span class="kwd">for</span><span class="pln"> x </span><span class="kwd">in</span><span class="pln"> range</span><span class="pun">(</span><span class="pln">len</span><span class="pun">(</span><span class="pln">li</span><span class="pun">)</span><span class="pln"> </span><span class="pun">-</span><span class="pln"> </span><span class="lit">1</span><span class="pln"> </span><span class="pun">-</span><span class="pln"> ad</span><span class="pun">):</span><span class="pln">
            mx </span><span class="pun">=</span><span class="pln"> max</span><span class="pun">(</span><span class="pln">li</span><span class="pun">[</span><span class="pln">x</span><span class="pun">],</span><span class="pln">li</span><span class="pun">[</span><span class="pln">x</span><span class="pun">+</span><span class="lit">1</span><span class="pun">])</span><span class="pln">
            </span><span class="kwd">if</span><span class="pln"> li</span><span class="pun">[</span><span class="pln">x</span><span class="pun">]</span><span class="pln"> </span><span class="pun">&gt;</span><span class="pln"> li</span><span class="pun">[</span><span class="pln">x </span><span class="pun">+</span><span class="pln"> </span><span class="lit">1</span><span class="pun">]:</span><span class="pln">li</span><span class="pun">[</span><span class="pln">x</span><span class="pun">],</span><span class="pln">li</span><span class="pun">[</span><span class="pln">x </span><span class="pun">+</span><span class="pln"> </span><span class="lit">1</span><span class="pun">]=</span><span class="pln">li</span><span class="pun">[</span><span class="pln">x </span><span class="pun">+</span><span class="pln"> </span><span class="lit">1</span><span class="pun">],</span><span class="pln">li</span><span class="pun">[</span><span class="pln">x</span><span class="pun">]</span><span class="pln">
            
    </span><span class="kwd">print</span><span class="pun">(</span><span class="pln">li</span><span class="pun">)</span><span class="pln">
paixu</span><span class="pun">([</span><span class="lit">4165</span><span class="pun">,</span><span class="lit">233454</span><span class="pun">,</span><span class="lit">44</span><span class="pun">,</span><span class="lit">5554</span><span class="pun">,</span><span class="lit">44</span><span class="pun">,</span><span class="lit">7557</span><span class="pun">,</span><span class="lit">6434</span><span class="pun">,</span><span class="lit">500</span><span class="pun">,</span><span class="lit">2000</span><span class="pun">])</span><button class="copy-code-button" type="button" data-clipboard-text="# python 冒泡排序
def paixu(li) :
    mx = 0
    for ad in range(len(li) - 1):
        for x in range(len(li) - 1 - ad):
            mx = max(li[x],li[x+1])
            if li[x] &gt; li[x + 1]:li[x],li[x + 1]=li[x + 1],li[x]
            
    print(li)
paixu([4165,233454,44,5554,44,7557,6434,500,2000])"></button></pre><p>
2022年4月11日在他人的基础上修改了，谢谢啦</p>

<p>下面是另一种排序方式：逐一挑出最小值，将最小值在原列表中删除，将最小值在新列表中添加，直到最后一个值（最大值）为止，到最后将新列表赋值给原列表，整个数组呈现从小到大的排序</p>

<pre class="prettyprint prettyprinted" style=""><span class="com"># python 其他排序</span><span class="pln">
list1</span><span class="pun">=([</span><span class="lit">4165</span><span class="pun">,</span><span class="lit">233454</span><span class="pun">,</span><span class="lit">44</span><span class="pun">,</span><span class="lit">5554</span><span class="pun">,</span><span class="lit">44</span><span class="pun">,</span><span class="lit">7557</span><span class="pun">,</span><span class="lit">6434</span><span class="pun">,</span><span class="lit">500</span><span class="pun">,</span><span class="lit">2000</span><span class="pun">])</span><span class="pln">
list2</span><span class="pun">=[]</span><span class="pln">
</span><span class="kwd">while</span><span class="pln"> len</span><span class="pun">(</span><span class="pln">list1</span><span class="pun">):</span><span class="pln">
    list2</span><span class="pun">.</span><span class="pln">append</span><span class="pun">(</span><span class="pln">min</span><span class="pun">(</span><span class="pln">list1</span><span class="pun">))</span><span class="pln">
    list1</span><span class="pun">.</span><span class="pln">remove</span><span class="pun">(</span><span class="pln">min</span><span class="pun">(</span><span class="pln">list1</span><span class="pun">))</span><span class="pln">
list1</span><span class="pun">=</span><span class="pln">list2
</span><span class="kwd">print</span><span class="pun">(</span><span class="pln">list1</span><span class="pun">)</span><button class="copy-code-button" type="button" data-clipboard-text="# python 其他排序
list1=([4165,233454,44,5554,44,7557,6434,500,2000])
list2=[]
while len(list1):
    list2.append(min(list1))
    list1.remove(min(list1))
list1=list2
print(list1)"></button></pre><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">Cai0029</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;Cai0029</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;cai***9@sohu.com</p></div></span>2年前 (2022-04-11)</div></div></li><!-- #comment-## -->
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